P1129 Jeep 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 Jeep 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 Jeep Description
What are the Possible Causes of the DTC P1129 Jeep?
- 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 Jeep?
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 Jeep 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.
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Frequently Asked Questions about P1129 Jeep Code
1. What are the common symptoms of OBDII code P1129 on a Jeep indicating Closed Loop Fueling Not Achieved in Bank 2?
- Common symptoms include poor fuel economy, rough idling, engine misfires, and hesitation during acceleration.
2. What are the possible causes of OBDII code P1129 in a Jeep related to Closed Loop Fueling Not Achieved in Bank 2?
- Potential causes include a faulty oxygen sensor, vacuum leaks, issues with the fuel system, or a malfunctioning catalytic converter.
3. How can I diagnose the OBDII code P1129 on my Jeep?
- You can diagnose this code by using an OBDII scanner to read the code, checking for any related symptoms, inspecting the oxygen sensor, and looking for any visible signs of damage or leaks in the engine bay.
4. Is it safe to continue driving my Jeep with OBDII code P1129 indicating Closed Loop Fueling Not Achieved in Bank 2?
- It is not recommended to drive your vehicle with this code as it can lead to further damage to the engine or other components. It is best to address the issue promptly.
5. What is the best course of action to repair OBDII code P1129 on a Jeep?
- The best course of action is to have a professional mechanic diagnose the issue accurately and perform the necessary repairs, which may involve replacing the oxygen sensor, fixing vacuum leaks, or addressing fuel system problems.
6. Can I reset the OBDII code P1129 on my Jeep by disconnecting the battery?
- While disconnecting the battery may clear the code temporarily, it is not a recommended long-term solution. The underlying issue causing the code needs to be properly diagnosed and repaired.
7. Are there any simple DIY checks I can perform to troubleshoot OBDII code P1129 on my Jeep?
- You can visually inspect the oxygen sensor and surrounding components for any signs of damage or wear. Checking for loose or disconnected vacuum hoses can also be helpful.
8. How long does it typically take to repair OBDII code P1129 on a Jeep at a repair shop?
- The repair time can vary depending on the exact cause of the issue and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the problem.
9. Will OBDII code P1129 on a Jeep cause the check engine light to illuminate?
- Yes, this code will trigger the check engine light to come on, indicating an issue with Closed Loop Fueling Not Achieved in Bank 2 that needs attention.
10. Can extreme weather conditions affect the likelihood of OBDII code P1129 occurring in a Jeep?
- Extreme weather conditions can potentially exacerbate existing issues related to fuel delivery, oxygen sensor performance, and other components, leading to the triggering of this code.
Discuss the causes and fixes for P1129 Jeep OBDII Code
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engine light on.got code for misfire,added injector clean, replaced spark plugs, replaced coils, now getting code po152, reset computor, now getting code p1129. this is for my 2007 jeep grand chrokee 3.7 4x4
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The Oxygen Sensor is the most common problem for the P1129 code, but it may take some driving after all the repairs you did, for the computer to adjust itself. I recommend to clear the code and drive it for a few days, before replacing any more parts.
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I got a p1129 code with a rough idle occasionally. Dont know what it is any suggestions?
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Let me check if I can find more information. What model and year is your Jeep?
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