P2221 – BMW DTC

BMW DTC P2221 – NOx Sensor Heater Sense Circuit (Bank 2)

DTC P2221 meaning on BMW

The Diagnostic Trouble Code (DTC) P2221 for BMW refers to an issue with the NOx (Nitrogen Oxide) sensor heater sense circuit in Bank 2. This code indicates that there is a problem with the electrical circuit responsible for monitoring the heater in the NOx sensor on Bank 2 of the vehicle.

BMW DTC P2221 symptoms

Symptoms of DTC P2221 on a BMW may include:

• Check Engine Light illuminated
• Reduced engine performance
• Increased emissions
• Possible decrease in fuel efficiency

BMW DTC P2221 causes

Common causes of DTC P2221 on a BMW include:

• Faulty NOx sensor heater
• Wiring or connector issues in the NOx sensor heater circuit
• Corrosion or damage to the sensor or its connections
• Issues with the engine control module (ECM)

BMW DTC P2221 seriousness

The seriousness of DTC P2221 on a BMW can vary. While the vehicle may still be operable with this code present, it is important to address the underlying issue promptly to prevent potential damage to the emissions system and ensure optimal engine performance.

How to diagnose DTC P2221 on BMW

To diagnose DTC P2221 on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the NOx sensor heater and its connections for any visible damage or corrosion
3. Check the wiring and connectors in the sensor heater circuit for continuity and proper voltage
4. Perform a resistance test on the NOx sensor heater to determine if it is functioning correctly

How to fix DTC P2221 on BMW

To fix DTC P2221 on a BMW, the following steps may be taken:

1. Replace the faulty NOx sensor heater if it is determined to be the cause of the issue
2. Repair or replace any damaged wiring or connectors in the sensor heater circuit
3. Clean any corrosion from the sensor and its connections
4. If necessary, reprogram or replace the engine control module (ECM)

How to erase DTC P2221 on BMW

To erase DTC P2221 on a BMW, the fault code can be cleared using a diagnostic scanner. After addressing the underlying issue that caused the code, the scanner can be used to reset the Check Engine Light and clear the DTC from the vehicle’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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