P1129 Mitsubishi Code - Closed Loop Fueling Not Achieved Bank 2
Quick Answer
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 amount of time ,when conditions would have otherwise closed loop operation. Common causes include Fuel delivery system, Engine Coolant Temperature (ECT) sensor or wiring connectors, MAP sensor or wiring connectors. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1129 Mitsubishi indicates Closed Loop Fueling Not Achieved Bank 2.
- Common causes
- Common causes include Fuel delivery system, Engine Coolant Temperature (ECT) sensor or wiring connectors, MAP sensor or wiring connectors.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1129 Mitsubishi Description
What are the Possible Causes of the DTC P1129 Mitsubishi?
- 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 the DTC P1129 Mitsubishi?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1129 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1129 Mitsubishi code?
Need more information on how to fix the P1129 Mitsubishi code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1129 Mitsubishi code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1129 Mitsubishi Code
What does the OBDII code P1129 mean for a Mitsubishi?
P1129 indicates that the engine control module (ECM) has detected that closed-loop fuel control was not achieved for Bank 2, meaning the system couldn't properly regulate the air-fuel mixture.
What are the common symptoms of the P1129 code in a Mitsubishi?
Symptoms may include poor fuel economy, reduced engine performance, rough idling, hesitation during acceleration, and the illumination of the check engine light.
What causes the P1129 code to appear?
Common causes include a faulty oxygen sensor, exhaust leaks, a malfunctioning mass airflow (MAF) sensor, a vacuum leak, or issues with the fuel injectors or fuel pressure regulator.
Can a dirty air filter trigger the P1129 code?
Yes, a clogged or dirty air filter can restrict airflow, affecting the air-fuel mixture and potentially triggering this code.
How do you diagnose the P1129 code in a Mitsubishi?
Diagnosis typically involves scanning the ECM for codes, inspecting the oxygen sensors, checking for vacuum or exhaust leaks, and testing the performance of the MAF sensor and fuel system.
Can I drive my Mitsubishi with a P1129 code?
Driving with this code is not recommended, as it can lead to reduced fuel efficiency, engine damage, or further emissions system issues if not addressed.
How can I fix the P1129 code on a Mitsubishi?
Repairs may involve replacing a faulty oxygen sensor, fixing exhaust or vacuum leaks, cleaning or replacing the MAF sensor, or addressing fuel system issues such as failing injectors or a bad fuel pressure regulator.
Is the P1129 code specific to Mitsubishi vehicles?
No, P1129 can appear on other vehicle brands, but the troubleshooting and repair process may vary depending on the make and model.
Does the P1129 code affect emissions?
Yes, since it indicates an issue with the air-fuel mixture, it can lead to higher emissions and potentially cause a failed emissions test.
How much does it cost to repair the P1129 code?
The repair cost depends on the underlying cause, ranging from $50 for a simple sensor replacement to $500 or more for complex repairs like fixing fuel system or exhaust issues.
Discuss the causes and fixes for P1129 Mitsubishi OBDII Code
Code P1129 Mitsubishi comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
