P1128 JEEP – Closed Loop Fueling Not Achieved Bank 1

P1128 JEEP Possible Causes

 

Fuel delivery system

  • Manifold Absolute Pressure (MAP) sensor or wiring connectors
  • O2 sensor wiring or connectors
  • Engine mechanical system
  • Faulty Powertrain Control Module (PCM)
 

How to Fix JEEP P1128 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)
 

P1128 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.

P1128 LEXUS – Malfunction of the throttle actuator control motor lock

P1128 LEXUS Possible Causes

  • Faulty throttle control motor
  • Throttle control motor harness is open or shorted
  • Poor electrical connection in throttle control motor circuit

How to Fix P1128 LEXUS 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 Engine Control Module (ECM) detects short circuits between the ECM and the throttle control motor.

Possible Symptoms

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

P1128 LEXUS Meaning

The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The current throttle valve opening angle is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle correctly in response to driving conditions.

P1128 LINCOLN – Front O2 Sensor Connectors Reversed

P1128 LINCOLN Possible Causes

  • Crossed HO2S wiring harness connectors
  • Powertrain Control Module (PCM) wiring harness connector
 

How to Fix P1128 LINCOLN 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)
 

P1128 LINCOLN Meaning

The Diagnostic Trouble Code (DTC) will set whenever the Powertrain Control Module (PCM) detects the upstream oxygen sensor is swapped from Bank to Bank. The Heated Exhaust Gas Oxygen (HEGO) sensor monitor checks and determines if the HO2S signal response to fuel trim change matches the correct engine bank. The code sets when the HO2S being tested is not indicated.

P1128 MAZDA – HO2S Heater O2 Sensor Too Cold Before KOER Test

How to Fix P1128 MAZDA 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)

P1128 MAZDA Meaning

Heated O2 Sensor HO2S Too Cold Before KOER Test is the generic description for Mazda code P1128, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Mazda P1128 OBDII code.

P1128 MERCURY – Front O2 Sensor Connectors Replaced

P1128 MERCURY Possible Causes

  • Crossed HO2S harness connectors
  • Powertrain Control Module (PCM) harness connector
 

How to Fix P1128 MERCURY 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)
 

P1128 MERCURY Meaning

The Diagnostic Trouble Code (DTC) will set whenever the Powertrain Control Module (PCM) detects the upstream oxygen sensor is swapped from Bank to Bank. The Heated Exhaust Gas Oxygen (HEGO) sensor monitor checks and determines whether the HO2S signal response for fuel trim matches the correct engine bank. The code sets when the HO2S being tested is not indicated.

P1128 MITSUBISHI – Closed Loop Fueling Not Achieved Bank 1

P1128 MITSUBISHI Possible Causes

  • Check fuel compensation values
  • Rich or lean air/fuel ratio
  • Open or short circuit condition
  • Faulty Manifold Absolute Pressure (MAP) sensor
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Faulty Oxygen sensor

How to Fix MITSUBISHI Code P1128?

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)

P1128 MITSUBISHI Meaning

Closed Loop Fueling Not Achieved Bank 1 is the generic description for Mitsubishi code P1128, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have further information about the Mitsubishi OBDII code P1128.

P1128 NISSAN – Throttle Control Motor Short Circuit

P1128 NISSAN Possible Causes

  • Faulty throttle control motor
  • Throttle control motor harness is open or shorted
  • Poor electrical connection in throttle control motor circuit

How to Fix NISSAN Code P1128?

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

When is the Code Detected?

The Engine Control Module (ECM) detects short circuits between the ECM and the throttle control motor.

Possible Symptoms

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

P1128 NISSAN Meaning

The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The current throttle valve opening angle is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle correctly in response to driving conditions.

P1128 TOYOTA – Throttle Actuator Control Motor Lock Malfunction

P1128 TOYOTA Possible Causes

  • Faulty throttle control motor
  • Throttle control motor wiring harness is open or short-circuited
  • Poor electrical connection in the throttle control motor circuit

How to Fix Toyota P1128 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 Engine Control Module (ECM) detects short circuits between the ECM and the throttle control motor.

Possible Symptoms

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

P1128 TOYOTA Meaning

The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The current throttle valve opening angle is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle correctly in response to driving conditions.

P1128 VOLKSWAGEN – Long Term Fuel Trim System B1 Too Lean

P1128 VOLKSWAGEN Possible Causes

  • Faulty mass air flow (MAF) sensor
  • Low fuel pressure
  • Engine vacuum leak
  • Faulty Bank 1 HO2S

How to Fix Volkswagen P1128 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)

P1128 VOLKSWAGEN Meaning

Long term fuel trim system B1 too lean is the generic description for Volkswagen P1128 code, but the manufacturer may have a different description for your model and vehicle year. Currently, we have no further information about Volkswagen P1128 OBDII code.

P1129 – Downstream Oxygen Sensors Swapped from One Bank to Another

P1129 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 Code P1129?

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)
  • Engine hard to start
  • Rough or erratic idle speed

P1129 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, surging, or rough idle.