SureTrack Community Real Fix: Exhaust NOx, We Answer

Real Fixes from the SureTrackĀ® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-onĀ® diagnostic software version.

2010 BMW 1-Series 2.0L Petrol

2AEC, Replaced NOx Sensor

The customer states the check engine light is on.

Connected a scan tool and found code 2AEC – Nitrogen Oxide Sensor, Self-Diagnosis. Performed a road test, used the scan tool to monitor live data and found the NOx sensor signal parameter was erratic. Visually inspected the NOx sensor wiring harness and found no obvious signs of damage. Disconnected the NOx sensor connector, visually inspected the connector and terminals and found no obvious signs of damage. With the key on, engine off, used a multi-meter, checked for voltage and ground at the NOx sensor connector and found both were present. Backprobed the NOx sensor, ran the engine, monitored the sensor signal on a lab scope and found the NOx sensor signal observed on the lab scope intermittently dropped out. The results of these tests verified the NOx sensor was faulty.

Replaced the NOx sensor, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.

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About the Author

Abagail Lucero

Abagail Lucero is the Product Marketing Manager for ProDemand. She joined the company in 2011 as a member of the SocialCRM shop marketing team and has served in many roles at Mitchell1, lastly as Security and Compliance Supervisor. Abagail holds a Bachelor of Science degree from California University of Pennsylvania.