P2218 – BMW DTC

BMW DTC P2218 – NOx Sensor Heater Control Circuit/Open (Bank 2)

DTC P2218 meaning on BMW

DTC P2218 indicates a fault in the NOx (Nitrogen Oxide) sensor heater control circuit for Bank 2 in a BMW vehicle. The Engine Control Module (ECM) monitors the NOx sensor’s heater circuit to ensure it is functioning properly. An open circuit in the heater control can trigger this diagnostic trouble code.

BMW DTC P2218 symptoms

Symptoms of DTC P2218 in a BMW may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Increased emissions

BMW DTC P2218 causes

Common causes of DTC P2218 in a BMW include:

• Faulty NOx sensor heater
• Open or short circuit in the NOx sensor heater wiring
• Defective Engine Control Module (ECM)

BMW DTC P2218 seriousness

DTC P2218 should be addressed promptly as it can lead to increased emissions and potential engine performance issues. Ignoring this fault may result in the vehicle failing emissions tests and could cause further damage to the engine components.

How to diagnose DTC P2218 on BMW

To diagnose DTC P2218 on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scan tool to retrieve the fault code and freeze frame data
2. Inspect the NOx sensor heater wiring for any visible damage or corrosion
3. Test the NOx sensor heater for proper resistance and continuity
4. Check the ECM for any related faults or issues

How to fix DTC P2218 on BMW

To fix DTC P2218 on a BMW, the following steps may be taken:

1. Repair or replace any damaged wiring in the NOx sensor heater circuit
2. Replace the faulty NOx sensor heater if necessary
3. If the ECM is found to be defective, it may need to be reprogrammed or replaced

How to erase DTC P2218 on BMW

After the underlying issue causing DTC P2218 on a BMW has been resolved, the fault code can be cleared using a diagnostic scan tool. This will reset the Check Engine Light and erase the DTC from the ECM’s memory.

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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