P0428 – BMW DTC

BMW DTC P0428 – Catalyst Temperature Sensor Circuit High (Bank 1 Sensor 1)

DTC P0428 meaning on BMW

The Diagnostic Trouble Code (DTC) P0428 for BMW indicates an issue with the Catalyst Temperature Sensor Circuit High on Bank 1 Sensor 1. This means that the engine control module (ECM) has detected a high voltage signal from the catalyst temperature sensor located before the catalytic converter on the bank 1 side of the engine.

BMW DTC P0428 symptoms

Symptoms of DTC P0428 on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Reduced engine performance
• Increased fuel consumption
• Possible sulfur or rotten egg smell from the exhaust

BMW DTC P0428 causes

Common causes of DTC P0428 on a BMW include:

• Faulty catalyst temperature sensor
• Wiring or connector issues in the sensor circuit
• ECM software or hardware problems

BMW DTC P0428 seriousness

While DTC P0428 may not cause immediate drivability issues, it is important to address this problem promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance and emissions compliance.

How to diagnose DTC P0428 on BMW

To diagnose DTC P0428 on a BMW, you can follow these steps:

1. Use an OBD-II scanner to retrieve the fault code and freeze frame data
2. Inspect the wiring and connectors of the catalyst temperature sensor for any damage or corrosion
3. Test the sensor’s resistance and voltage output using a multimeter
4. Check for any software updates for the ECM related to this code

How to fix DTC P0428 on BMW

To fix DTC P0428 on a BMW, you can try the following:

1. Replace the faulty catalyst temperature sensor
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Clear the fault code and perform a test drive to verify the repair

How to erase DTC P0428 on BMW

To erase DTC P0428 on a BMW, you can use an OBD-II scanner to clear the fault code from the ECM’s memory. After the repair has been completed, clearing the code will reset the Check Engine Light and allow you to monitor the system 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

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.