P20E4 – BMW DTC

BMW DTC P20E4 – Exhaust Gas Temperature Sensor 2/3 Correlation (Bank 1)

DTC P20E4 meaning on BMW

The Diagnostic Trouble Code (DTC) P20E4 for BMW refers to the Exhaust Gas Temperature Sensor 2/3 Correlation on Bank 1. This code indicates that there is a discrepancy between the readings of the exhaust gas temperature sensor 2 and sensor 3 on Bank 1 of the vehicle’s exhaust system.

BMW DTC P20E4 symptoms

Symptoms of the BMW DTC P20E4 may include:

• Check Engine Light (MIL) illuminated on the dashboard
• Reduced engine performance or power
• Increased fuel consumption
• Engine running rough or misfiring

BMW DTC P20E4 causes

Common causes of the BMW DTC P20E4 include:

• Failed exhaust gas temperature sensor 2 or sensor 3
• Wiring or connector issues in the exhaust gas temperature sensor circuit
• Exhaust system leaks or damage
• Software or calibration issues

BMW DTC P20E4 seriousness

The BMW DTC P20E4 should not be ignored as it can lead to potential engine performance issues and increased emissions. It is recommended to address this code promptly to prevent further damage to the vehicle.

How to diagnose DTC P20E4 on BMW

To diagnose the DTC P20E4 on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes and freeze frame data
2. Inspect the exhaust gas temperature sensor 2 and sensor 3 for any visible damage or corrosion
3. Check the wiring and connectors in the exhaust gas temperature sensor circuit for any issues
4. Perform a visual inspection of the exhaust system for leaks or damage
5. Conduct a sensor resistance test or voltage test to verify sensor functionality

How to fix DTC P20E4 on BMW

To fix the DTC P20E4 on a BMW, the following steps may be taken:

1. Replace the faulty exhaust gas temperature sensor 2 or sensor 3
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Address any leaks or damage in the exhaust system
4. Perform a software update or calibration if necessary

How to erase DTC P20E4 on BMW

To erase the DTC P20E4 on a BMW, the fault codes can be cleared using a diagnostic scanner. After the necessary repairs have been made to address the underlying issue causing the fault code, the codes can be cleared to reset the Check Engine Light and monitor the vehicle for any recurring issues.

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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