BMW DTC P204F – Reductant System Performance (Bank 1)
DTC P204F meaning on BMW
DTC P204F on a BMW indicates an issue with the Reductant System Performance in Bank 1. This fault code is related to the Selective Catalytic Reduction (SCR) system, which helps reduce harmful emissions by injecting a urea-based solution into the exhaust stream to convert nitrogen oxides into harmless nitrogen and water.
BMW DTC P204F symptoms
Symptoms of DTC P204F on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Increased fuel consumption
- Failed emissions test
BMW DTC P204F causes
Common causes of DTC P204F on a BMW include:
- Low DEF (Diesel Exhaust Fluid) level
- DEF contamination or quality issues
- Malfunctioning DEF injector
- Faulty NOx sensor
- Wiring or connection issues
BMW DTC P204F seriousness
DTC P204F should not be ignored as it can lead to increased emissions and potential regulatory compliance issues. Additionally, prolonged driving with this fault code may cause damage to the catalytic converter and other emission control components.
How to diagnose DTC P204F on BMW
To diagnose DTC P204F on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the DEF tank level and quality
- Check the DEF injector and NOx sensor for proper operation
- Inspect wiring and connections for any damage or corrosion
How to fix DTC P204F on BMW
To fix DTC P204F on a BMW, the following steps may be taken:
- Refill or replace the DEF fluid if low or contaminated
- Replace a faulty DEF injector or NOx sensor
- Repair any damaged wiring or connections
- Clear the fault code and perform a test drive to ensure the issue is resolved
How to erase DTC P204F on BMW
To erase DTC P204F on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s memory. After the repair has been completed, the mechanic can perform this step to reset the Check Engine Light and verify that the issue has been resolved.
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.