P1129 CHRYSLER – Closed Loop Not Achieved Bank 2

P1129 CHRYSLER Possible Causes

  • Fuel system
  • Engine Coolant Temperature (ECT) sensor or wiring connectors
  • MAP sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system

How to Fix P1129 CHRYSLER 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)

P1129 CHRYSLER Meaning

The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated duration, when conditions would otherwise have closed loop operation.

P1129 DODGE – Closed Loop Fueling Not Achieved Bank 2

P1129 DODGE Possible Causes

  • Fuel delivery system
  • Engine Coolant Temperature (ECT) sensor or wiring connectors
  • MAP sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system

How to Fix P1129 DODGE 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.

Possible Symptoms

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

P1129 DODGE Meaning

The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated duration when conditions would otherwise have closed loop operation.

P1129 FORD – Downstream Oxygen Sensors Swapped From One Bank to Another

P1129 FORD Possible Causes

Crossed HO2S harness connectors (downstream) HO2S wiring crossed at harness connectors (downstream) HO2S wiring crossed at 104-pin harness connectors (downstream)

How to Fix P1129 FORD 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 soon-to-be-service engine warning light)

P1129 FORD Meaning

The Heated Oxygen Sensor (HO2S) monitor determines whether the HO2S signal response for a fuel change matches the correct engine bank. The test fails when a response from the tested HO2S is not indicated.

P1129 HONDA – Manifold Absolute Pressure Sensor Circuit Higher Than Expected

P1129 HONDA Possible Causes

  • Faulty Manifold Absolute Pressure Sensor
  • Manifold Absolute Pressure Sensor harness is open or shorted
  • Poor electrical connection in the Manifold Absolute Pressure Sensor circuit

How to Fix P1129 HONDA 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)
  • Engine hard to start
  • Rough or erratic idle

P1129 HONDA Meaning

The Manifold Absolute Pressure (MAP) sensor generates a signal proportional to the amount of vacuum in the intake manifold. The signal is sent to the Engine Control Module (ECM) and the information is used to control the air/fuel mixture ratio. A faulty MAP sensor can cause engine stalling, over-revving, or rough idle.

P1129 JEEP – Closed Loop Not Achieved Bank 2

P1129 JEEP Possible Causes

  • Fuel delivery system
  • Engine Coolant Temperature (ECT) sensor or wiring connectors
  • MAP sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system

Symptoms

possible

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

P1129 JEEP Meaning

The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated duration, when conditions would otherwise have closed loop operation.

P1129 LAND-ROVER – Left Side to Right Side HO2S Sensors Swapped

P1129 LAND-ROVER Possible Causes

  • Left side to right side swapped HO2S sensors
 

How to fix P1129 LAND-ROVER 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)
 

P1129 LAND-ROVER Meaning

Left side to right side swapped HO2S sensors is the generic description for Land-rover code P1129, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have any other information about Land-rover OBDII code P1129.

P1129 LEXUS – Malfunction of the Electronic Throttle Control System

P1129 LEXUS Possible Causes

  • Faulty Electronic Throttle Control System (ETCS) actuator
  • Electronic Throttle Control System (ETCS) actuator harness is open or shorted
  • Electronic Throttle Control System (ETCS) actuator circuit Poor electrical connection

How to Fix Code P1129 LEXUS?

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 P1129 code is set when the throttle opening angle continues to vary significantly from the target throttle opening angle.

Possible Symptoms

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

P1129 LEXUS Meaning

The Electronic Throttle Control System (ETCS) consists of the throttle motor to actuate the throttle valve, the electromagnetic clutch to connect the throttle motor to the throttle valve, the throttle position sensor to detect the throttle valve opening angle, the accelerator pedal position sensor to detect the accelerator pedal position, the Engine Control Module (ECM) to control the ETCS, and the single throttle valve body.
The ECM controls the throttle motor to make the throttle valve opening angle properly under responsive driving conditions.
The throttle position sensor which is mounted on the throttle body detects the throttle valve opening angle and provides feedback to the ECM to control the throttle motor.
In case of ETCS malfunction, the ECM cuts power to the throttle motor and the magnetic clutch, and the throttle valve is completely closed by the return spring.
However, the throttle valve opening angle can be controlled by the accelerator pedal via the throttle cable.

P1129 LINCOLN – Downstream Oxygen Sensors Swapped from One Bank to Another

P1129 LINCOLN Possible Causes

Crossed HO2S harness connectors (downstream) HO2S wiring crossed at harness connectors (downstream) HO2S wiring crossed at 104-pin harness connectors (downstream)

How to Fix Lincoln P1129 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)

P1129 LINCOLN Meaning

The Heated Oxygen Sensor (HO2S) monitor determines whether the HO2S signal response for a fuel change matches the correct engine bank. The test fails when a response from the tested HO2S is not indicated.

P1129 MERCURY – Downstream Oxygen Sensors Swapped from One Bank to Another

P1129 Possible Causes

Crossed HO2S harness connectors (downstream) HO2S wiring crossed at harness connectors (downstream) HO2S wiring crossed at 104-pin harness connectors (downstream)

How to Fix P1129 Code MERCURY?

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)

P1129 MERCURY Meaning

The Heated Oxygen Sensor (HO2S) monitor determines whether the HO2S signal response for a fuel change matches the correct engine bank. The test fails when a response from the tested HO2S is not indicated.

P1129 MITSUBISHI – Closed Loop Fueling Not Achieved Bank 2

P1129 MITSUBISHI Possible Causes

  • Fuel supply system
  • Engine coolant temperature (ECT) sensor or wiring connectors
  • MAP sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system

How to Fix P1129 MITSUBISHI 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)

P1129 MITSUBISHI Meaning

The powertrain control module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated duration, when conditions would otherwise have closed loop operation.