P1299 – BMW DTC

BMW DTC P1299 – Serial Communication NOx Sensor (Bank 2)

DTC P1299 meaning on BMW

The DTC P1299 code on a BMW indicates a fault in the serial communication with the NOx sensor located in Bank 2 of the vehicle’s exhaust system. This error typically points to a problem with the sensor itself or the communication circuit.

BMW DTC P1299 symptoms

Symptoms of a DTC P1299 code on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Reduced engine performance or power
• Possible increase in emissions

BMW DTC P1299 causes

Common causes of a DTC P1299 code on a BMW include:

• Defective NOx sensor in Bank 2
• Wiring or connector issues in the communication circuit
• Faulty Engine Control Module (ECM)

BMW DTC P1299 seriousness

The DTC P1299 code should not be ignored as it can lead to increased emissions, reduced engine performance, and potential long-term damage if left unresolved. It is recommended to address this issue promptly to ensure the vehicle operates efficiently and meets emission standards.

How to diagnose DTC P1299 on BMW

To diagnose a DTC P1299 code on a BMW, follow these steps:

1. Use an OBD-II scanner to retrieve the specific fault code
2. Inspect the wiring and connectors related to the NOx sensor in Bank 2
3. Test the NOx sensor for proper functionality
4. Check for any other related fault codes that may provide additional information

How to fix DTC P1299 on BMW

To fix a DTC P1299 code on a BMW, consider the following actions:

1. Replace the faulty NOx sensor in Bank 2
2. Repair or replace any damaged wiring or connectors in the communication circuit
3. If necessary, replace the Engine Control Module (ECM)
4. Clear the fault code and perform a test drive to ensure the issue is resolved

How to erase DTC P1299 on BMW

To erase a DTC P1299 code on a BMW, you can:

1. Use an OBD-II scanner to clear the fault code
2. Alternatively, disconnect the vehicle’s battery for a few minutes to reset the ECM and clear the code
3. After clearing the code, monitor the vehicle for any recurrence of the issue

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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