BMW DTC P20E9 – Reductant Pressure Too High
DTC P20E9 meaning on BMW
DTC P20E9 on a BMW indicates that the reductant pressure is too high. The reductant system is responsible for reducing harmful emissions by injecting a urea-based solution into the exhaust stream. The pressure in the reductant system is monitored to ensure proper operation and emission control.
BMW DTC P20E9 symptoms
Symptoms of DTC P20E9 on a BMW may include the check engine light illuminating on the dashboard. In some cases, the vehicle may go into a reduced power mode to prevent damage to the engine or emissions system.
BMW DTC P20E9 causes
The high reductant pressure indicated by DTC P20E9 on a BMW can be caused by a variety of factors. Common causes include a malfunctioning reductant pressure sensor, a clogged reductant injector, or a faulty reductant pump. Additionally, issues with the reductant tank or its components can also lead to this fault code.
BMW DTC P20E9 seriousness
While DTC P20E9 may not cause immediate drivability issues, it is important to address this fault code promptly to ensure proper emission control and prevent potential damage to the vehicle’s emissions system. Ignoring this fault code can lead to increased emissions and may result in the vehicle failing emissions tests.
How to diagnose DTC P20E9 on BMW
To diagnose DTC P20E9 on a BMW, a diagnostic scan tool capable of reading BMW-specific fault codes is required. The technician will need to inspect the reductant system components, including the pressure sensor, injector, pump, and associated wiring. Testing the reductant system for proper operation and pressure levels will help pinpoint the root cause of the high reductant pressure.
How to fix DTC P20E9 on BMW
Fixing DTC P20E9 on a BMW involves addressing the underlying cause of the high reductant pressure. This may include replacing a faulty reductant pressure sensor, cleaning or replacing a clogged reductant injector, or repairing a malfunctioning reductant pump. Ensuring that the reductant system components are functioning correctly and that there are no leaks in the system is crucial to resolving this fault code.
How to erase DTC P20E9 on BMW
Once the underlying issue causing DTC P20E9 on a BMW has been fixed, the fault code can be cleared using a diagnostic scan tool. The technician can use the scan tool to erase the fault code from the vehicle’s engine control module memory. After clearing the code, it is recommended to test drive the vehicle to ensure that the fault does not reoccur.
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.