How severe is this DTC?

The severity will be moderately high here. When reading this, a certain sense of urgency should be applied to maintain effective engine operation. Whenever a fault can directly affect critical values such as air/fuel ratios and is actively present, you should not operate your vehicle to avoid engine damage. That said, if you’ve driven the vehicle since the fault became active, don’t worry too much, you’re probably fine. Key takeaway: if left unaddressed, this fault could lead to costly internal engine damage in the future.

What are some symptoms of the code?

Symptoms of a P222F fault code may include:

• Lack of engine power and performance (or limited)
• Engine misfire
• Abnormal engine noise(s)
• Fuel odor
• Decreased fuel economy
• Reduced throttle responsiveness

What are some common causes of the code?

Causes of this P222F code may include:

• Faulty or damaged BAP (Barometric Air Pressure) sensor
• Faulty or damaged electrical connector
• Wiring issue (e.g., open circuit, short circuit, corrosion)
• Electrical short (internal or mechanical)
• Loose electrical connection
• Heat damage
• Mechanical malfunction causing altered BAP readings
• ECM (Engine Control Module) problem

What are the troubleshooting steps for P222F?

Basic Step #1

Locate the BAP (Barometric Air Pressure) sensor on your specific vehicle. The location of these sensors has varied significantly in my experience, so finding the correct sensor should be of utmost importance. Once located, inspect the BAP sensor for any physical damage. Potential issues may depend on the location, so consider the sensor’s environment (i.e., high-heat areas, engine vibrations, exposure to weather/road debris, etc.).

Basic Step #2

Ensure the sensor connector itself is properly installed to maintain a good electrical connection. Especially if the sensor is located on the engine, it may be subject to vibrations that could loosen connections or cause physical damage.

NOTE: Remember to disconnect your battery before disconnecting sensors. Depending on the vehicle/system/sensor, you could cause damaging electrical spikes if you forget this step. That said, if you feel uncomfortable here or have limited fundamental electrical knowledge, I recommend towing/driving your vehicle to your trusted repair center.

Basic Step #3

Is something obstructing the sensor? This could cause false atmospheric pressure readings. Accurate readings are integral to optimal engine performance in these fuel management systems.

Basic Step #4

Using your multimeter and armed with the desired electrical values for the barometric air pressure sensor. You’ll need to disconnect the sensor connector itself to access the pins. Once you see the pins, follow manufacturer-specific diagnostic procedures with the desired values and compare. Anything outside the specified range will indicate a faulty sensor. Replace it following proper removal and reinstallation procedures.

How severe is this DTC?

The severity will be moderately high here. When reading this, a certain sense of urgency should be applied to maintain effective engine operation. Whenever a fault can directly affect critical values such as air/fuel ratios and is actively present, you should not operate your vehicle to avoid engine damage. That said, if you’ve driven the vehicle since the fault became active, don’t worry too much, you’re probably fine. Key takeaway: if left unaddressed, this fault could lead to costly internal engine damage in the future.

What are some symptoms of the code?

Symptoms of a P2230 fault code may include:

• Lack of engine power and performance (or limited)
• Engine misfire
• Abnormal engine noise(s)
• Fuel odor
• Decreased fuel economy
• Reduced throttle responsiveness

What are some common causes of the code?

Causes of this P2230 code may include:

• Faulty or damaged BAP (Barometric Air Pressure) sensor
• Faulty or damaged electrical connector
• Wiring issue (e.g., open circuit, short circuit, corrosion)
• Electrical short circuit (internal or mechanical)
• Loose electrical connection
• Heat damage
• Mechanical malfunction causing altered BAP readings
• ECM (Engine Control Module) problem

What are the troubleshooting steps for P2230?

Basic Step #1

Locate the BAP (Barometric Air Pressure) sensor on your specific vehicle. The location of these sensors has varied significantly in my experience, so finding the correct sensor should be of utmost importance. Once located, inspect the BAP sensor for any physical damage. Potential issues may depend on the location, so consider the sensor’s environment (i.e., high-heat areas, engine vibrations, exposure to weather/road debris, etc.).

Basic Step #2

Ensure the sensor connector itself is properly installed to maintain a good electrical connection. Especially if the sensor is located on the engine, it may be subject to vibrations that could loosen connections or cause physical damage.

NOTE: Remember to disconnect your battery before disconnecting sensors. Depending on the vehicle/system/sensor, you could cause damaging electrical spikes if you forget this step. That said, if you feel uncomfortable here or have limited basic electrical knowledge, I recommend towing/driving your vehicle to your trusted repair center.

Basic Step #3

Is something obstructing the sensor? This could cause false atmospheric pressure readings. Accurate readings are integral to optimal engine performance in these fuel management systems.

Basic Step #4

Using your multimeter and armed with the desired electrical values for the barometric air pressure sensor. You’ll need to disconnect the sensor connector itself to access the pins. Once you see the pins, follow manufacturer-specific diagnostic procedures with the desired values and compare. Anything outside the specified range will indicate a faulty sensor. Replace it following proper removal and reinstallation procedures.

How severe is this DTC?

A shorted HO2S could cause very poor engine operation and various driving issues. A P2232 code should be classified as severe and rectified as quickly as possible.

What are some symptoms of the code?

Symptoms of a P2232 trouble code may include:

• Reduced fuel efficiency
• Decreased engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes of this code may include:

• Faulty oxygen sensor(s)
• Burned, chafed, broken, or disconnected wiring and/or connectors
• PCM programming error or faulty PCM

What are the troubleshooting steps for P2232?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and reliable vehicle information source will be needed to accurately diagnose a P2232 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2232 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused the P2232 to store may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring schematics, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

If the P2232 code continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe oxygen sensor input data on the data stream. Narrow the scope of the data stream to include only relevant data and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that aren’t functioning properly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to obtain live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will need replacement.

In most cases, you’ll rectify this code by replacing the HO2S in question but still complete your diagnosis.

How severe is this DTC?

A short-circuited HO2S could cause very poor engine performance and various driving issues. A P2233 code should be classified as severe and repaired as quickly as possible.

What are some symptoms of the code?

Symptoms of a P2233 trouble code may include:

• Reduced fuel efficiency
• Decreased engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

• Faulty oxygen sensor(s)
• Burned, rubbed, broken, or disconnected wiring and/or connectors
• PCM programming error or faulty PCM

What are the troubleshooting steps for P2233?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and reliable vehicle information source will be needed to accurately diagnose a P2233 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2233 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused the P2233 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring schematics, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

If the P2233 code continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and monitor oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that are not functioning properly should be considered defective if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to obtain live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will need replacement.

In most cases, you will fix this code by replacing the affected HO2S but still complete your diagnosis.

How severe is this DTC?

A shorted HO2S could cause very poor engine operation and various driving issues. A P2234 code should be classified as severe and rectified as quickly as possible.

What are some symptoms of the code?

Symptoms of a P2234 trouble code may include:

• Reduced fuel efficiency
• Decreased engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes of this code may include:

• Faulty oxygen sensor(s)
• Burned, chafed, broken, or disconnected wiring and/or connectors
• PCM programming error or faulty PCM

What are the troubleshooting steps for P2234?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and reliable vehicle information source will be needed to accurately diagnose a P2234 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2234 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused P2234 to store may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

If P2234 continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you’ll get faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that aren’t functioning properly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to obtain live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will need replacement.

In most cases, you’ll rectify this code by replacing the HO2S in question but still complete your diagnosis.

How severe is this DTC?

A shorted HO2S could cause very poor engine operation and various driving issues. A P2235 code should be classified as severe and rectified as quickly as possible.

What are some symptoms of the code?

Symptoms of a P2235 trouble code may include:

• Reduced fuel efficiency
• Decreased engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes of this code may include:

• Faulty oxygen sensor(s)
• Burned, chafed, broken, or disconnected wiring and/or connectors
• PCM programming error or faulty PCM

What are the P2235 troubleshooting steps?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and reliable vehicle information source will be needed to accurately diagnose a P2235 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2235 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused P2235 to store may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring diagrams, and diagnostic flowcharts (relevant to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

If P2235 continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe oxygen sensor input data on the data stream. Limit the data stream scope to include only relevant data and you’ll get faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that aren’t functioning properly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to obtain live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will need replacement.

In most cases, you’ll rectify this code by replacing the affected HO2S but still complete your diagnosis.

How severe is this DTC?

A shorted HO2S could cause very poor engine operation and various driving issues. A P2236 code should be classified as severe and fixed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2236 trouble code may include:

• Reduced fuel efficiency
• Decreased engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

• Faulty oxygen sensor(s)
• Burned, rubbed, broken, or disconnected wiring and/or connectors
• PCM programming error or faulty PCM

What are the troubleshooting steps for P2236?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to accurately diagnose a P2236 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2236 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused P2236 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of wiring and connectors related to the HO2S. Replace wiring that has been cut, burned, or damaged.

If the P2236 code continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that are not functioning properly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to get live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will need replacement.

In most cases, you will fix this code by replacing the HO2S in question but still complete your diagnosis.

How severe is this DTC?

An HO2S with a control circuit issue could lead to very poor engine performance and various driving problems. A P2237 code should be classified as severe and fixed as soon as possible.

What are some symptoms of the code?

Symptoms of a P2237 trouble code may include:

• Reduced fuel efficiency
• Decreased engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illuminated

What are some common causes of the code?

Causes

of this code may include:

• Faulty oxygen sensor(s)
• Burned, chafed, broken, or disconnected wiring and/or connectors
• PCM programming error or faulty PCM

What are the troubleshooting steps for P2237?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to accurately diagnose a P2237 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2237 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused P2237 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring schematics, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

Disconnect the HO2S in question and use the DVOM to check resistance between the positive current control circuit and ground circuits. If there is continuity, suspect a faulty HO2S.

If the P2237 code continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that are not functioning properly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to get live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will require HO2S replacement.

In most cases, you will fix this type of code by replacing the HO2S in question but still complete your diagnosis.

How severe is this DTC?

An HO2S with a control circuit issue could lead to very poor engine performance and various driving problems. A P2238 code should be classified as severe and fixed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2238 trouble code may include:

• Reduced fuel efficiency
• Decreased engine performance
• Stored misfire codes or lean/rich exhaust codes
• Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

• Faulty oxygen sensor(s)
• Burned, rubbed, broken, or disconnected wiring and/or connectors
• PCM programming error or faulty PCM

What are the troubleshooting steps for P2238?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to accurately diagnose a P2238 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2238 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused the P2238 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring schematics, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of the wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

Disconnect the HO2S in question and use the DVOM to check resistance between the positive current control circuit and ground circuits. If there is continuity, suspect a faulty HO2S.

If the P2238 code continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that are not functioning properly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to get live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will require HO2S replacement.

In most cases, you will fix this type of code by replacing the HO2S in question but still complete your diagnosis.