P1131 BUICK – Low Variance in HO2S Circuit, Bank 1 Sensor 2

How to Fix P1131 BUICK Code?

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)

P1131 BUICK Meaning

A Heated Exhaust Oxygen Sensor (HO2S) indicating lean at the end of a test attempts to correct a too rich condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.

P1131 CADILLAC – Low HO2S Circuit Variance, Bank 1 Sensor 2

How to Fix P1131 CADILLAC Code?

Possible Symptoms

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

P1131 CADILLAC Meaning

A Heated Exhaust Gas Oxygen Sensor (HO2S) indicating lean at the end of a test attempts to correct a too rich condition. The test fails when the fuel control system no longer detects switching for a calibrated duration.

P1131 CHRYSLER – Internal Power Supply Issue for Glow Plug Control Module

P1131 CHRYSLER Possible Causes

Faulty glow plug control module (GPCM)
Glow plug control module harness is open or shorted
Poor electrical connection in glow plug control module circuit

How to Fix P1131 CHRYSLER Code?

When is the Code Detected?

The engine control module (ECM) detected a problem in the glow plug control module

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1131 CHRYSLER Meaning

Glow plug control module internal fault voltage supply problem is the generic description for Chrysler code P1131, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about Chrysler P1131 OBDII code.

P1131 FORD – Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Bank 1 Lean

P1131 FORD Possible Causes

Faulty upstream oxygen sensor, bank 1
High or low fuel pressure
Dirty/faulty MAF sensor
Engine vacuum leak
Leaking fuel injector or fuel pressure regulator
Faulty Powertrain Control Module (PCM)

How to Fix P1131 FORD Code?

Technical Notes

The code means the Powertrain Control Module (PCM) has detected a lean system, meaning there is not enough fuel or an excessive amount of air in the system. Start by checking for vacuum leaks.

When is the Code Detected?

When an HO2S sensor indicates lean at the end of a test, the system tries to correct an over-lean condition. The code is set when the fuel control system no longer detects switching for a calibrated duration.

Possible Symptoms

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

P1131 FORD Meaning

The Heated Oxygen Sensor (HO2S) monitor is a built-in strategy designed to monitor HO2S sensors for any malfunction or deterioration that could affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). Downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. An input is required from engine coolant temperature (ECT) or cylinder head temperature (CHT), intake air temperature (IAT), mass air flow (MAF), throttle position (TP), and crankshaft position (CKP) to activate the HO2S monitor. The fuel system monitor and misfire detection monitor must also have completed successfully before the HO2S monitor is activated.
• The HO2S sensor detects the oxygen content in the exhaust stream and delivers a voltage between zero and 1.0 volt. At stoichiometric lean (air/fuel ratio of about 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. At stoichiometric rich, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S monitor evaluates both the upstream (fuel control) and downstream (catalyst monitor) HO2S for proper operation.
• Once the HO2S monitor is activated, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum threshold voltage that can be calibrated.
• A fixed-frequency closed-loop fuel control routine is executed, and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and
measuring the current through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.

P1131 HYUNDAI – Fuel Injection Quantity Adjustment

Possible Causes

Injection Problem: Poor regulation of the injected fuel quantity.
Faulty Sensor: Malfunctioning air/fuel ratio sensor or oxygen sensor.
Air Intake Leak: Presence of an uncontrolled air intake disrupting the air/fuel mixture.
Clogged or Defective Injectors: Poor fuel atomization.
Electrical Issue: Damaged wiring, short circuit, or poor connection in the injection circuit.

How to Fix Code P1131 HYUNDAI?

Check the possible causes mentioned above.
Visually inspect the wiring harness and connectors of the injection circuit and oxygen sensor.
Look for visible defects: damaged wires, corroded connectors, broken or misaligned pins.
Check for air leaks in the intake system and ensure the injectors are functioning properly.
Perform an electronic diagnostic to verify sensor values and make necessary adjustments.

Possible Symptoms

Check engine light on (or warning light indicating an imminent problem).
Unstable idle or frequent stalling.
Poor fuel consumption and reduced performance.

Meaning of Code P1131 HYUNDAI

Code P1131 is generally related to fuel injection quantity adjustment. This is a generic description, but the manufacturer Hyundai may provide a more precise explanation depending on the vehicle model and year. To date, there is no additional specific information available about this OBDII code for Hyundai.

P1131 INFINITI – Turbulence Control Valve Control Solenoid

P1131 INFINITI Possible Causes

What does this mean?

Faulty swirl control valve control solenoid valve
Swirl control valve control solenoid valve circuit open or shorted
Swirl control valve circuit open or shorted
Faulty swirl control valve
Faulty swirl control valve actuator

How to fix P1131 INFINITI code?

When is the code detected?

The P1131 code is detected when an incorrect voltage signal is sent to the Engine Control Module (ECM) via the swirl control valve control solenoid valve.

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1131 INFINITI Meaning

This system has a swirl control valve in the intake passage of each cylinder.
At idle and during low engine speed operation, the swirl control valve closes. This increases the air speed in the intake passage, promoting fuel vaporization and creating 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 during low engine speed operation, 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.
The solenoid valve controls the closed/open condition of the swirl control valve. This solenoid valve is operated by the Engine Control Module (ECM).
The swirl control valve control solenoid valve responds to signals from the ECM. When the ECM sends an ON signal (ground), the solenoid valve is bypassed to apply intake manifold vacuum to the swirl control valve actuator. This operation closes the swirl control valve. When the ECM sends an OFF signal, the vacuum signal is cut off and the swirl control valve opens.

P1131 LINCOLN – Lack of Heated Oxygen Sensor Switch Sensor Upstream Indicates Bank 1 Lean

P1131 LINCOLN Possible Causes

Faulty upstream oxygen sensor, bank 1
High or low fuel pressure
Dirty/faulty MAF sensor
Engine vacuum leak
Leaking fuel injector or fuel pressure regulator
Faulty Powertrain Control Module (PCM)

How to Fix P1131 LINCOLN Code?

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

Technical Notes

The code means the Powertrain Control Module (PCM) has detected a lean system, meaning there is not enough fuel or an excessive amount of air in the system. Start by checking for vacuum leaks.

When is the Code Detected?

Possible Symptoms

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

P1131 LINCOLN Meaning

The Heated Oxygen Sensor (HO2S) monitor is an integrated strategy designed to monitor HO2S sensors for any malfunction or deterioration that could affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). Downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. An input is required from engine coolant temperature (ECT) or cylinder head temperature (CHT), intake air temperature (IAT), mass air flow (MAF), throttle position (TP), and crankshaft position (CKP) to activate the HO2S monitor. The fuel system monitor and misfire detection monitor must also have completed successfully before the HO2S monitor is activated.
• The HO2S sensor detects the oxygen content in the exhaust stream and delivers a voltage between zero and 1.0 volt. At stoichiometric lean (air/fuel ratio of about 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. At stoichiometric rich, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S monitor evaluates both the upstream (fuel control) and downstream (catalyst monitor) HO2S for proper operation.
• Once the HO2S monitor is activated, the amplitude of the upstream HO2S signal voltage and the response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum threshold voltage that can be calibrated.
• A fixed-frequency closed-loop fuel control routine is executed, and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and
measuring the current flowing through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.

P1131 MAZDA – Upstream Heated Oxygen Sensor Switch Missing – Sensor Indicates Lean – Bank 1

P1131 MAZDA Possible Causes

Vacuum leak affecting bank 1 only
Fuel injector problem, bank 1
Check for cylinder misfires on bank 1
Engine mechanical condition
Faulty O2 sensor.

How to fix P1131 MAZDA code?

Technical Notes

Although the oxygen (O2) sensor, the engine control module (ECM) detected a lean system, meaning there is not enough fuel or an excessive amount of air in the system. Start by checking for vacuum leaks.

When is the code detected?

The engine control module (ECM) detected oxygen (O2) from bank 1 at its lean limit

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1131 MAZDA Meaning

Lack of heated oxygen sensor upstream switch – Sensor indicates lean – Bank 1 is the generic description for Mazda P1131 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have more information about the Mazda P1131 OBDII code.

P1131 MERCURY – Upstream Heated Oxygen Sensor Switch Sensor Lack Indicates Bank 1 Lean

P1131 MERCURY Possible Causes

Faulty upstream oxygen sensor, bank 1
High or low fuel pressure
Dirty/faulty MAF sensor
Engine vacuum leak
Leaking fuel injector or fuel pressure regulator
Faulty powertrain control module (PCM)

How to Fix P1131 MERCURY Code?

Technical Notes

The code means the powertrain control module (PCM) detected a lean system, meaning there is not enough fuel or an excessive amount of air in the system. Start by checking for vacuum leaks.

When is the Code Detected?

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1131 MERCURY Meaning

The Heated Oxygen Sensor (HO2S) monitor is an on-board strategy designed to monitor HO2S sensors for any malfunction or deterioration that could affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). Downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. An input is required from engine coolant temperature (ECT) or cylinder head temperature (CHT), intake air temperature (IAT), mass air flow (MAF), throttle position (TP), and crankshaft position (CKP) to activate the HO2S monitor. The fuel system monitor and misfire detection monitor must also have completed successfully before the HO2S monitor is activated.
• The HO2S sensor detects the oxygen content in the exhaust stream and delivers a voltage between zero and 1.0 volts. At lean stoichiometry (air/fuel ratio of about 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volts. At rich stoichiometry, the HO2S will generate a voltage between 0.45 and 1.0 volts.
• The HO2S monitor evaluates both the upstream (fuel control) and downstream (catalyst monitor) HO2S for proper operation.
• Once the HO2S monitor is activated, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum threshold voltage that can be calibrated.
• A fixed-frequency closed-loop fuel control routine is executed, and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and
measuring the current flowing through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.

P1131 MINI – Oxygen Sensor Behind Aging Catalytic Converter 2

P1131 MINI Possible Causes

Faulty oxygen sensor
Oxygen sensor harness is open or shorted
Poor electrical connection in oxygen sensor circuit

How to Fix P1131 MINI Code?

O2 sensor circuit dynamic test, test bench 2 sensor 2

Possible Symptoms

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

P1131 MINI Meaning

The oxygen sensor behind catalytic converter 2 Aging is the generic description for P1131 Mini code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the P1131 Mini OBDII code.