U05A9
NOx Sensor C Received Invalid Data From ECM/PCM
U05A9 is an OBD-II diagnostic trouble code meaning: NOx Sensor C Received Invalid Data From ECM/PCM. Common causes: nox c sensor malfunction, damage to the wiring to the nox sensor. Estimated repair cost: $167–444.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Problems with passing technical inspection
- Possible transition to emergency mode
Causes
- NOx C sensor malfunction
- Damage to the wiring to the NOx sensor
- Poor contact in connectors
- Software error in the ECU
- Sensor power problems
How to Fix
- Check the condition of the wiring and connectors of the NOx C sensor
- Read error codes and sensor data using a scanner
- Check the power supply and ground of the sensor
- Replace NOx C sensor if necessary
- Update the ECU firmware if appropriate service bulletins are available
Related codes
Error U05A9 by Vehicle Brand
FAQ
What does the U05A9 code mean?
U05A9 is an OBD-II diagnostic trouble code that indicates: NOx Sensor C Received Invalid Data From ECM/PCM
What causes a U05A9 error code?
The most common causes of U05A9 include: NOx C sensor malfunction; Damage to the wiring to the NOx sensor; Poor contact in connectors; Software error in the ECU.
How do I fix a U05A9 diagnostic trouble code?
To fix U05A9: Check the condition of the wiring and connectors of the NOx C sensor. Read error codes and sensor data using a scanner. Check the power supply and ground of the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U05A9?
Yes, but get it checked soon
How much does it cost to fix U05A9?
The estimated repair cost for U05A9 is $167–444. Actual cost depends on your vehicle, location, and labor rates.
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