P1138 BMW – Low Voltage in O2 Sensor Heater Circuit, Bank 1 Sensor 2

P1138 BMW Possible Causes

  • Faulty HO2S, Bank 1 Sensor 2
  • Open or short circuit in Bank 1 Sensor 2 HO2S wiring harness
  • Poor electrical connection in Bank 1 Sensor 2 HO2S circuit

How to Fix BMW P1138 Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or soon-to-be service engine warning light)

BMW P1138 Meaning

Low voltage in O2 sensor heater circuit, Bank 1 Sensor 2 is the generic description for BMW P1138 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have more information about the BMW P1138 OBDII code.

P1138 BUICK – HO2S 2 Circuit High Voltage Sensor

P1138 BUICK Possible Causes

  • Faulty HO2S, Bank 1 Sensor 2
  • Open or short circuit in Bank 1 Sensor 2 HO2S wiring harness
  • Poor electrical connection in Bank 1 Sensor 2 HO2S circuit

How to Fix P1138 BUICK Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1138 BUICK Meaning

To control emissions, a catalytic converter converts harmful exhaust gas emissions into harmless water vapor and carbon dioxide. The Powertrain Control Module (PCM) can monitor this process using a Heated Oxygen Sensor 2 (HO2S 2). The HO2S 2, located in the exhaust stream after the catalytic converter, produces an output signal that indicates the catalyst’s storage capacity. This signal indicates the catalyst’s ability to effectively convert exhaust emissions. If the catalyst is functioning properly, the HO2S 2 signal will be much less active than the signal produced by the Front Heated Oxygen Sensor 1 (HO2S 1).

P1138 CADILLAC – High Voltage Circuit Sensor HO2S 2

P1138 CADILLAC Possible Causes

  • Faulty HO2S, Bank 1 Sensor 2
  • Open or short circuit in Bank 1 Sensor 2 HO2S wiring harness
  • Poor electrical connection in Bank 1 Sensor 2 HO2S circuit

How to Fix P1138 CADILLAC Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or soon-to-be-service engine warning light)

P1138 CADILLAC Meaning

To control emissions, a catalytic converter converts harmful exhaust gas emissions into harmless water vapor and carbon dioxide. The Powertrain Control Module (PCM) can monitor this process using a Heated Oxygen Sensor 2 (HO2S 2). The HO2S 2, located in the exhaust stream beyond the catalytic converter, produces an output signal that indicates the catalyst’s storage capacity. This signal indicates the catalyst’s ability to effectively convert exhaust emissions. If the catalyst is functioning properly, the HO2S 2 signal will be much less active than the signal produced by the Heated Oxygen Sensor 1 (HO2S 1).

P1138 CHEVROLET – High Voltage Circuit HO2S 2 Sensor

P1138 CHEVROLET Possible Causes

  • Faulty HO2S, Bank 1 Sensor 2
  • Open or short circuit in Bank 1 Sensor 2 HO2S wiring harness
  • Poor electrical connection in Bank 1 Sensor 2 HO2S circuit

How to Fix P1138 CHEVROLET Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1138 CHEVROLET Meaning

To control emissions, a catalytic converter converts harmful exhaust gas emissions into harmless water vapor and carbon dioxide. The Powertrain Control Module (PCM) can monitor this process using a heated rear oxygen sensor 2 (HO2S 2). The HO2S 2, located in the exhaust stream beyond the catalytic converter, produces an output signal that indicates the catalyst’s storage capacity. This signal indicates the catalyst’s ability to effectively convert exhaust emissions. If the catalyst is functioning properly, the HO2S 2 signal will be much less active than the signal produced by the front heated oxygen sensor 1 (HO2S 1).

P1138 FORD – Lack of Heated Oxygen Sensor Switches Sensor 2 Bank 1 Switch Indicates Rich

P1138 FORD Possible Causes

  • Exhaust gas leaks
  • Faulty Heated Oxygen Sensor 2 (HO2S2) (downstream), Bank 1
  • Open or short circuit in Bank 1 Heated Oxygen Sensor 2 wiring harness
  • Poor electrical connection in Heated Oxygen Sensor 2 circuit, Bank 1
  • Inappropriate fuel pressure
  • Faulty fuel injectors

How to Fix Code P1138 FORD?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms
  • Check Engine Light On (or Service Engine Soon Warning Light)

P1138 FORD Meaning

The Heated Oxygen Sensor 2 (HO2S2) (downstream), located after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gases on each bank. For optimal catalyst operation, the air-fuel mixture (air-fuel ratio) must remain close to the ideal stoichiometric ratio. The HO2S2 output voltage changes abruptly near the stoichiometric ratio. The Powertrain Control Module (PCM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S2 generates a voltage between 0.1 and 0.9 V in response to the oxygen in the exhaust gases. If the oxygen in the exhaust gases increases, the air-fuel ratio becomes lean. The PCM interprets Lean when the HO2S2 voltage is below 0.45 V. If the oxygen in the exhaust gases decreases, the air-fuel ratio becomes rich. The PCM interprets Rich when the HO2S2 voltage is above 0.45 V.

P1138 GMC – High Voltage Circuit Sensor HO2S 2

P1138 GMC Possible Causes

  • Faulty HO2S, Bank 1 Sensor 2
  • Open or shorted circuit in Bank 1 Sensor 2 HO2S harness
  • Poor electrical connection in Bank 1 Sensor 2 HO2S circuit

How is P1138 GMC Code Repaired?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1138 GMC Meaning

To control emissions, a catalytic converter converts harmful exhaust gas emissions into harmless water vapor and carbon dioxide. The Powertrain Control Module (PCM) can monitor this process using a Heated Oxygen Sensor 2 (HO2S 2). The HO2S 2, located in the exhaust stream after the catalytic converter, produces an output signal that indicates the catalyst’s storage capacity. This signal indicates the catalyst’s ability to effectively convert exhaust emissions. If the catalyst is functioning properly, the HO2S 2 signal will be much less active than the signal produced by the Front Heated Oxygen Sensor 1 (HO2S 1).

P1138 INFINITI – Turbulence Control Valve Actuator System Performance

P1138 INFINITI Possible Causes

  • Faulty swirl control valve control position sensor
  • Swirl control valve control position sensor harness is open or shorted
  • Poor electrical connection in the swirl control valve control position sensor circuit
  • Faulty swirl control valve
 

How to Fix P1138 INFINITI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

 
 

When is the Code Detected?

The P1138 code is detected when the target opening angle of the swirl control valve controlled by the Engine Control Module (ECM) and the input signal from the swirl control valve position sensor are not within the normal range.

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)
 

P1138 INFINITI Meaning

At idle and during low engine coolant temperature, the swirl control valve closes, thus increasing the air speed in the intake passage, promoting fuel vaporization and producing a swirl in the combustion chamber.
Due to this operation, this system tends to increase the combustion speed of the gas mixture, improve fuel consumption, and increase stability under operating conditions.
Additionally, except at idle and when the engine coolant temperature is low, this system opens the swirl control valve.
In this condition, this system tends to increase power by improving intake efficiency through the reduction of intake flow resistance, intake flow.
The swirl control valve is actuated by the Engine Control Module (ECM).

P1138 ISUZU – HO2S 2 Voltage Remains Very Rich

P1138 ISUZU Possible Causes

  • Leaking injector or regulator
  • Poor engine ignition
  • Engine mechanical condition
  • Faulty HO2S
  • HO2S 2 sensor harness open or shorted
  • Poor electrical connection in HO2S 2 sensor circuit

How to Fix ISUZU Code P1138?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine warning light soon to come on)

P1138 ISUZU Meaning

HO2S 2 Voltage Stays High Rich Condition is the generic description for Isuzu code P1138, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about Isuzu OBDII code P1138.

P1138 LINCOLN – Heated Oxygen Sensor Switches Malfunction Bank 1 Sensor 2 Switch Indicates Rich

P1138 LINCOLN Possible Causes

  • Exhaust gas leaks
  • Faulty Heated Oxygen Sensor 2 (HO2S2) (downstream), Bank 1
  • Open or shorted Bank 1 Heated Oxygen Sensor 2 harness
  • Poor electrical connection in Bank 1 Heated Oxygen Sensor 2 circuit
  • Inappropriate fuel pressure
  • Faulty fuel injectors

How to Fix Code P1138 LINCOLN?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or soon-to-be-serviced engine warning light)

P1138 LINCOLN Meaning

The Heated Oxygen Sensor 2 (HO2S2) (downstream), after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gases on each bank. For optimal catalyst operation, the air-fuel mixture (air-fuel ratio) must remain close to the ideal stoichiometric ratio. The HO2S2 output voltage changes abruptly around the stoichiometric ratio. The Powertrain Control Module (PCM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S2 generates a voltage between 0.1 and 0.9 V in response to the oxygen in the exhaust gases. If the oxygen in the exhaust gases increases, the air-fuel ratio becomes lean. The PCM interprets Lean when the HO2S2 voltage is below 0.45 V. If the oxygen in the exhaust gases decreases, the air-fuel ratio becomes rich. The PCM interprets Rich when the HO2S2 voltage is above 0.45 V.

P1138 MAZDA – Rear O2 Sensor Self-Test Error

P1138 MAZDA Possible Causes

  • Faulty rear O2 sensor
  • Rear O2 sensor harness is open or shorted
  • Poor electrical connection in rear O2 sensor circuit

How to Fix Code P1138 MAZDA?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or service engine soon warning light)

P1138 MAZDA Meaning

Rear O2 Sensor Self-Test Error is the generic description for Mazda code P1138, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Mazda OBDII P1138 code.