The OBD code P1129 for Chrysler indicates an issue with the fuel delivery system, Engine Coolant Temperature (ECT) sensor or wiring connectors, MAP sensor or wiring connectors, O2 sensor wiring or connectors, or engine mechanical system.
Symptoms include the Engine Light being ON.
To fix this, inspect the mentioned components for damage and check connector pins for any issues.
This issue should be addressed promptly to prevent further damage.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
Symptoms of the Chrysler p1129 OBD Code
The vehicle may experience poor acceleration and engine stalling with Chrysler fault code P1129.
- Symptoms: Engine Light ON.
- Reduced engine power.
- Engine may stall at idle.
- Rough idle.
- Engine hesitation during acceleration.
Causes of the Chrysler p1129 OBD Code
Possible triggers for Chrysler P1129 include a faulty MAP sensor, vacuum leaks, or a malfunctioning throttle position sensor.
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- P1129 can be caused by a faulty fuel delivery system.
- A malfunctioning Engine Coolant Temperature (ECT) sensor or wiring connectors.
- A defective MAP sensor or wiring connectors.
- Faulty O2 sensor wiring or connectors.
- Issues within the engine mechanical system.
Fixing Chrysler Error Code p1129 Step By Step
Address the issue by inspecting the throttle control system for potential faults or failures.
- To fix Chrysler OBDII code P1129, start by reviewing the ‘Possible Causes’ mentioned above and visually examining the corresponding wiring harness and connectors.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Next, verify the operation of the throttle position sensor (TPS) and ensure it is functioning correctly.
- If the TPS is faulty, replace it with a new one.
- Finally, reset the fault codes using a scan tool and test drive the vehicle to confirm the repair.
Cost Of Fixing Chrysler p1129 Fault Code
The repair for Chrysler fault code P1129 may involve replacing the downstream oxygen sensor.
The cost to diagnose and fix Chrysler OBD code P1129 typically ranges from $75 to $150, based on an estimated repair time of 1. 0 hour.
Factors like shop rates and complexity of the issue can influence the final cost.
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Details of the Chrysler p1129 OBD Code
Chrysler fault code P1129 relates to an issue with the downstream oxygen sensor.
Code P1129 for Chrysler vehicles indicates an issue with the downstream oxygen sensor on bank 1. This sensor is responsible for monitoring the efficiency of the catalytic converter.
The Engine Control Module (ECM) triggers this code when it detects that the downstream oxygen sensor is not providing the expected signal or is not functioning properly.
This can lead to increased emissions and reduced fuel efficiency.
Mechanic’s Tech Notes
For Chrysler code P1129, check for issues with the MAP sensor or vacuum leaks.
To diagnose and fix OBDII code P1129 on a Chrysler vehicle, start by checking the throttle control module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
If communication issues are detected, reprogramming or reflashing the TCM may be necessary.
Additionally, inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
By performing these tests and inspections, you can pinpoint the root cause of the P1129 fault code and proceed with the appropriate repairs.
FAQ
Common symptoms for Chrysler OBD code P1129 include Engine Light ON, caused by issues with fuel delivery system, ECT sensor, MAP sensor, O2 sensor, or engine mechanical system. Fix: Inspect and repair related components.
The typical root cause of OBD code P1129 in a Chrysler vehicle is related to issues with the Engine Coolant Temperature (ECT) sensor or wiring connectors.
Diagnose and repair OBD code P1129 in your Chrysler by checking fuel delivery system, ECT sensor, MAP sensor, O2 sensor, and engine components for wiring or connector issues.
Wrap Up
If your Chrysler is displaying OBDII code P1129 along with poor engine performance and high fuel consumption, it may indicate a fault in the downstream oxygen sensor circuit.
This could be caused by a faulty downstream oxygen sensor, damaged wiring, or a poor electrical connection.
To address Chrysler OBDII code P1129, start by inspecting the downstream oxygen sensor and its wiring harness for any signs of damage or corrosion.
Test the sensor’s electrical connector for proper connection and continuity.
If necessary, replace the downstream oxygen sensor and repair any wiring issues to resolve the fault.
