P2046 – BMW DTC

BMW DTC P2046 – Reductant Temperature Sensor ‘A’ Circuit Intermittent

DTC P2046 meaning on BMW

DTC P2046 indicates an intermittent issue with the Reductant Temperature Sensor ‘A’ circuit in a BMW vehicle. The reductant temperature sensor is a crucial component of the Selective Catalytic Reduction (SCR) system, which helps reduce harmful emissions by injecting a urea-based solution into the exhaust stream.

BMW DTC P2046 symptoms

Symptoms of DTC P2046 in a BMW may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Increased fuel consumption
• Possible urea injection system faults

BMW DTC P2046 causes

Common causes of DTC P2046 on a BMW include:

• Faulty reductant temperature sensor ‘A’
• Wiring or connector issues in the sensor circuit
• Corrosion or contamination affecting sensor operation
• Software or calibration issues

BMW DTC P2046 seriousness

While DTC P2046 may not cause immediate drivability issues, it can lead to increased emissions and potential long-term engine damage if left unresolved. It is important to address this fault promptly to maintain optimal vehicle performance and environmental compliance.

How to diagnose DTC P2046 on BMW

To diagnose DTC P2046 on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the reductant temperature sensor ‘A’ and its wiring for damage or corrosion
3. Check the sensor’s resistance and compare it to specifications
4. Verify proper sensor operation and signal output

How to fix DTC P2046 on BMW

To fix DTC P2046 on a BMW, the following steps may be taken:

1. Replace the faulty reductant temperature sensor ‘A’
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Clean or replace components affected by corrosion or contamination
4. Perform a software update or calibration if necessary

How to erase DTC P2046 on BMW

After addressing the underlying issue causing DTC P2046 on a BMW, the fault code can be erased using a diagnostic scanner. This will clear the code from the vehicle’s memory and turn off the Check Engine Light. It is important to ensure that the repair has been successful before clearing the fault code.

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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