BMW DTC P20EE – SCR NOx Catalyst Efficiency Below Threshold (Bank 1)
DTC P20EE meaning on BMW
The Diagnostic Trouble Code (DTC) P20EE for BMW indicates that the Selective Catalytic Reduction (SCR) system’s Nitrogen Oxide (NOx) Catalyst efficiency on Bank 1 is below the specified threshold. This means that the catalytic converter is not effectively reducing the NOx emissions to the required level, which can lead to increased pollution and potential regulatory compliance issues.
BMW DTC P20EE symptoms
Symptoms of the BMW DTC P20EE may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance or power
- Increased fuel consumption
- Failed emissions test
BMW DTC P20EE causes
Common causes of the BMW DTC P20EE may include:
- Contaminated or degraded DEF (Diesel Exhaust Fluid)
- Malfunctioning NOx sensor
- Issues with the SCR catalyst
- Exhaust leaks or system damage
BMW DTC P20EE seriousness
The BMW DTC P20EE is a serious issue that should be addressed promptly. Ignoring this fault can lead to increased emissions, potential engine damage, and may result in the vehicle failing emissions tests or not meeting environmental regulations.
How to diagnose DTC P20EE on BMW
To diagnose the BMW DTC P20EE, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and data related to the SCR system
- Inspect the NOx sensor and wiring for any damage or corrosion
- Check the DEF quality and level
- Perform a visual inspection of the SCR system components for any signs of damage or leaks
How to fix DTC P20EE on BMW
To fix the BMW DTC P20EE, the following steps may be taken:
- Replace the contaminated or degraded DEF with a fresh, high-quality DEF
- Repair or replace any malfunctioning NOx sensors
- Inspect and replace the SCR catalyst if necessary
- Repair any exhaust leaks or system damage
How to erase DTC P20EE on BMW
To erase the DTC P20EE on a BMW, the fault codes can be cleared using a diagnostic scanner. After addressing the underlying issue causing the fault code, the scanner can be used to clear the code and reset the Check Engine Light. It is important to ensure that the root cause of the fault has been resolved before clearing the code to prevent it from reoccurring.
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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