P0424 – BMW DTC

BMW DTC P0424 – Heated Catalyst Temperature Below Threshold (Bank 1)

DTC P0424 meaning on BMW

DTC P0424 indicates that the Heated Catalyst Temperature is below the threshold on Bank 1 in a BMW vehicle. This code is triggered when the Engine Control Module (ECM) detects that the temperature of the heated catalyst is not within the expected range.

BMW DTC P0424 symptoms

Symptoms of DTC P0424 in a BMW may include:

• Check Engine Light illuminated on the dashboard
• Reduced engine performance
• Increased fuel consumption

BMW DTC P0424 causes

The common causes of DTC P0424 in a BMW are:

• Faulty Heated Catalyst Temperature Sensor
• Wiring issues in the sensor circuit
• ECM software malfunction

BMW DTC P0424 seriousness

While DTC P0424 may not cause immediate drivability issues, it is important to address this code promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

How to diagnose DTC P0424 on BMW

To diagnose DTC P0424 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
2. Inspect the Heated Catalyst Temperature Sensor and its wiring for any visible damage or corrosion.
3. Check the sensor’s resistance and voltage values to ensure it is functioning correctly.
4. Perform a visual inspection of the catalytic converter for any signs of damage or overheating.

How to fix DTC P0424 on BMW

To fix DTC P0424 on a BMW, consider the following steps:

1. Replace the Heated Catalyst Temperature Sensor if it is found to be faulty.
2. Repair any damaged wiring in the sensor circuit.
3. Update the ECM software to the latest version to address any software-related issues.
4. Clear the fault codes using a diagnostic scanner after completing the repairs.

How to erase DTC P0424 on BMW

To erase DTC P0424 on a BMW, use a diagnostic scanner to clear the fault codes stored in the ECM. After completing the necessary repairs and ensuring that the issue has been resolved, clearing the fault codes will reset the Check Engine Light and turn off the DTC P0424 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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