U05A1

NOx Sensor A Received Invalid Data From ECM/PCM

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$167–444 (est.)

Symptoms

Increased fuel consumption
Check Engine Light Illuminates
Reduced engine power
Unpleasant exhaust smell
Possible transition to emergency mode

Causes

NOx sensor malfunction
Damage to the wiring to the NOx sensor
Problems with sensor connectors
Engine control unit malfunction
Software error in ECM/PCM

How to Fix

Check the integrity of the wiring to the NOx sensor
Inspect the sensor connectors for corrosion or damage.
Check NOx sensor readings using a diagnostic scanner
If necessary, replace the NOx sensor
Update ECM/PCM software

Related codes

U05A0 U05A2 P2200