BMW DTC P1174 – Fuel Trim Adaptation Malfunction (Bank 1)
DTC P1174 meaning on BMW
The Diagnostic Trouble Code (DTC) P1174 for BMW indicates a Fuel Trim Adaptation Malfunction on Bank 1. This means that the engine control module (ECM) has detected an issue with the fuel mixture being too lean or too rich on the bank 1 side of the engine.
BMW DTC P1174 symptoms
Symptoms of DTC P1174 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 P1174 causes
Common causes of DTC P1174 on a BMW include:
- Vacuum leaks
- Faulty oxygen sensor
- Dirty or clogged fuel injectors
- Fuel pressure regulator issues
- Intake air leaks
BMW DTC P1174 seriousness
While DTC P1174 may not cause immediate harm to the vehicle, it can lead to decreased fuel efficiency and engine performance if left unresolved. Ignoring this issue may result in further damage to engine components over time.
How to diagnose DTC P1174 on BMW
To diagnose DTC P1174 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect for any visible signs of vacuum leaks or damaged components
- Check the oxygen sensor readings and fuel trims
- Perform a fuel pressure test
How to fix DTC P1174 on BMW
To fix DTC P1174 on a BMW, the following steps may be taken:
- Repair any vacuum leaks or damaged components
- Replace the faulty oxygen sensor if necessary
- Clean or replace clogged fuel injectors
- Address any issues with the fuel pressure regulator
- Clear the fault codes and reset the ECM
How to erase DTC P1174 on BMW
To erase DTC P1174 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. Once the issue has been resolved and the necessary repairs have been made, clearing the fault codes will reset the system and turn off the Check Engine Light.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.