P22AA – BMW DTC

BMW DTC P22AA – NOx Sensor Heater Sense Circuit Intermittent (Bank 1 Sensor 2)

DTC P22AA meaning on BMW

The DTC P22AA error code on a BMW indicates an issue with the NOx (Nitrogen Oxide) sensor heater sense circuit for Bank 1 Sensor 2. This fault code specifically points to an intermittent problem with the sensor’s heating element or the circuit responsible for monitoring the heater’s operation.

BMW DTC P22AA symptoms

Symptoms associated with the DTC P22AA code on a BMW may include:

• Check Engine Light (MIL) illuminated on the dashboard
• Reduced engine performance or power
• Increased fuel consumption
• Possible emission control system warnings

BMW DTC P22AA causes

Common causes of the DTC P22AA error code on a BMW include:

• Faulty NOx sensor heater
• Wiring or connector issues in the sensor heater circuit
• Corrosion or damage to sensor components
• Software or calibration issues

BMW DTC P22AA seriousness

The DTC P22AA code should not be ignored as it can lead to increased emissions, reduced fuel efficiency, and potential engine performance issues. While the vehicle may still be operable with this fault, it is recommended to address the problem promptly to prevent further damage and ensure optimal engine operation.

How to diagnose DTC P22AA on BMW

To diagnose the DTC P22AA code on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the specific fault code and related data
2. Inspect the NOx sensor heater and its wiring for any visible damage or corrosion
3. Check the sensor heater circuit for continuity and proper voltage supply
4. Perform a sensor heater resistance test to determine if the heating element is functioning correctly
5. Verify software and calibration updates for the NOx sensor system

How to fix DTC P22AA on BMW

To address the DTC P22AA code on a BMW, the following steps may be taken:

1. Replace the faulty NOx sensor heater if it is determined to be the root cause
2. Repair any damaged wiring or connectors in the sensor heater circuit
3. Clean or replace sensor components affected by corrosion or contamination
4. Perform software updates or recalibrations as recommended by the manufacturer

How to erase DTC P22AA on BMW

After addressing the underlying issue causing the DTC P22AA code on a BMW, the fault code can be cleared using a diagnostic scanner. To erase the code:

1. Connect the scanner to the vehicle’s OBD-II port
2. Select the option to clear diagnostic trouble codes (DTCs)
3. Follow the on-screen prompts to confirm the deletion of the P22AA code
4. Verify that the code has been successfully cleared by rescanning the system

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.