BMW DTC P202D – Reductant Leakage
DTC P202D meaning on BMW
DTC P202D for BMW indicates a fault related to reductant leakage. Reductant is a substance used in the Selective Catalytic Reduction (SCR) system to reduce harmful emissions. The system injects reductant into the exhaust stream to convert nitrogen oxides into harmless nitrogen and water vapor.
BMW DTC P202D symptoms
Symptoms of DTC P202D on a BMW may include the Check Engine Light being illuminated, reduced engine performance, increased fuel consumption, and potential emissions issues. In some cases, there may be a noticeable smell of ammonia or other unusual odors.
BMW DTC P202D causes
The causes of DTC P202D on a BMW can vary, but common reasons include a leak in the reductant supply system, a faulty reductant injector, damaged reductant lines, or issues with the SCR catalyst. Contaminated reductant fluid or a malfunctioning reductant level sensor can also trigger this fault code.
BMW DTC P202D seriousness
DTC P202D should not be ignored as it can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter. Continuing to drive with this fault unresolved may result in the vehicle failing emissions tests and could harm the environment.
How to diagnose DTC P202D on BMW
To diagnose DTC P202D on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and perform a visual inspection of the reductant system components. They may also conduct tests on the reductant injector, check for leaks in the system, and verify the functionality of the reductant level sensor.
How to fix DTC P202D on BMW
Fixing DTC P202D on a BMW involves addressing the root cause of the reductant leakage. This may include repairing or replacing damaged reductant lines, fixing leaks in the system, replacing a faulty reductant injector, or addressing issues with the SCR catalyst. Ensuring the reductant fluid is clean and the reductant level sensor is functioning properly is also crucial.
How to erase DTC P202D on BMW
Once the underlying issue causing DTC P202D on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. After the repair is completed, the mechanic can erase the code, reset the Check Engine Light, and verify that the fault does not return during subsequent driving cycles.
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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