Audi DTC P1147 – O2 Control (Bank 2) System too lean
DTC P1147 meaning on Audi
The Diagnostic Trouble Code (DTC) P1147 for Audi indicates that the O2 Control System for Bank 2 is detecting a lean air-fuel mixture. This means that there is an imbalance in the air-fuel ratio, with an excess of air compared to fuel in the mixture being delivered to the engine.
Audi DTC P1147 symptoms
Symptoms associated with DTC P1147 on an Audi may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Reduced engine performance
Audi DTC P1147 causes
The potential causes of DTC P1147 on an Audi can include:
- Vacuum leaks in the intake system
- Faulty oxygen sensor (Bank 2 Sensor 1)
- Issues with the fuel delivery system
- Exhaust leaks
- Problems with the Mass Air Flow (MAF) sensor
Audi DTC P1147 seriousness
While DTC P1147 may not cause immediate harm to the engine, it can lead to decreased fuel efficiency and performance if left unresolved. Ignoring this DTC can also potentially cause damage to other components of the vehicle over time.
How to diagnose DTC P1147 on Audi
To diagnose DTC P1147 on an Audi, a mechanic may perform the following steps:
- Use an OBD-II scanner to retrieve the specific fault code
- Inspect the oxygen sensor for Bank 2 to check for any signs of damage or malfunction
- Check for vacuum leaks in the intake system
- Test the Mass Air Flow (MAF) sensor for proper operation
- Inspect the exhaust system for leaks
How to fix DTC P1147 on Audi
To address DTC P1147 on an Audi, the following steps may be taken:
- Repair any vacuum leaks in the intake system
- Replace the oxygen sensor for Bank 2 if it is faulty
- Clean or replace the Mass Air Flow (MAF) sensor
- Fix any exhaust leaks present
- Ensure the fuel delivery system is functioning correctly
How to erase DTC P1147 on Audi
After addressing the underlying issue causing DTC P1147 on an Audi, the fault code can be cleared using an OBD-II scanner. This will reset the Check Engine Light and allow the vehicle’s onboard computer to monitor the system for any new faults.
Recommended tools for Audi diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
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.