BMW DTC P1168 – Post Catalyst Fuel Trim System Correction Value above Threshold (Bank 1)
DTC P1168 meaning on BMW
The Diagnostic Trouble Code (DTC) P1168 on a BMW indicates that the Post Catalyst Fuel Trim System Correction Value for Bank 1 is above the threshold set by the vehicle’s Engine Control Module (ECM). This means that the ECM has detected that the fuel mixture is too rich in the exhaust gases after passing through the catalytic converter on Bank 1.
BMW DTC P1168 symptoms
Symptoms of a DTC P1168 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Reduced engine performance
BMW DTC P1168 causes
The common causes of a DTC P1168 on a BMW include:
- Faulty oxygen sensor
- Leaking or clogged fuel injectors
- Issues with the catalytic converter
- Vacuum leaks in the intake system
- Incorrect fuel pressure
BMW DTC P1168 seriousness
Ignoring a DTC P1168 on a BMW can lead to potential damage to the catalytic converter and other engine components. It can also result in poor fuel economy and increased emissions, which may cause the vehicle to fail emissions tests.
How to diagnose DTC P1168 on BMW
To diagnose a DTC P1168 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the oxygen sensor readings
- Check for fuel injector leaks or clogs
- Inspect the catalytic converter for damage
- Test the fuel pressure
- Check for vacuum leaks in the intake system
How to fix DTC P1168 on BMW
To fix a DTC P1168 on a BMW, the following steps may be taken:
- Replace the faulty oxygen sensor
- Clean or replace clogged fuel injectors
- Repair or replace the catalytic converter if necessary
- Fix any vacuum leaks in the intake system
- Ensure correct fuel pressure
How to erase DTC P1168 on BMW
After fixing the underlying issue causing the DTC P1168 on a BMW, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and erase the DTC from the vehicle’s ECM memory.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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