Infiniti DTC P1148 – Closed Loop Control (Bank 1)
DTC P1148 meaning on Infiniti
DTC P1148 on an Infiniti refers to a fault in the closed-loop control system for Bank 1. This diagnostic trouble code indicates that the Engine Control Module (ECM) has detected a problem with the closed-loop control system’s operation on Bank 1 of the engine.
Infiniti DTC P1148 symptoms
Symptoms of DTC P1148 on an Infiniti may include:
- Check Engine Light illuminated
- Decreased fuel efficiency
- Engine running rough or misfiring
- Reduced engine performance
Infiniti DTC P1148 causes
Common causes of DTC P1148 on an Infiniti include:
- Faulty Air/Fuel Ratio Sensor
- Issues with the fuel system
- Vacuum leaks
- Exhaust system leaks
Infiniti DTC P1148 seriousness
DTC P1148 should be addressed promptly as it can lead to decreased engine performance and fuel efficiency. Ignoring this fault may result in further damage to engine components over time.
How to diagnose DTC P1148 on Infiniti
To diagnose DTC P1148 on an Infiniti, a mechanic may perform the following steps:
- Use a scan tool to retrieve the DTC and freeze frame data
- Inspect the Air/Fuel Ratio Sensor for proper operation
- Check for vacuum leaks or exhaust system leaks
- Inspect the fuel system for any issues
How to fix DTC P1148 on Infiniti
To fix DTC P1148 on an Infiniti, the following steps may be taken:
- Replace the faulty Air/Fuel Ratio Sensor
- Repair any vacuum leaks or exhaust system leaks
- Clean or replace fuel system components as needed
- Clear the DTC and test drive the vehicle to ensure the issue is resolved
How to erase DTC P1148 on Infiniti
To erase DTC P1148 on an Infiniti, the fault code can be cleared using a scan tool. After the repair has been completed, the scan tool can be used to clear the DTC from the ECM’s memory. Once cleared, the Check Engine Light should turn off if the issue has been successfully resolved.
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