U05A5

Invalid Data Received From NH3 Sensor

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased emissions of harmful substances
Check Engine light comes on
Reduced engine power
Unstable engine idling

Causes

NH3 sensor malfunction
Damage to the sensor wiring harness
Poor contact in the sensor connector
Problems with the SCR control module
Sensor contamination

How to Fix

Check the integrity of the sensor wiring harness
Clean the contacts of the sensor connector
Check the functionality of the NH3 sensor
Replace sensor if necessary
Check and update control module software

Related codes

U05A0 U05A1 U05A6