P2C79
NOx Adsorber - Sulfur Limit Exceeded
P2C79 is an OBD-II diagnostic trouble code meaning: NOx Adsorber - Sulfur Limit Exceeded. Common causes: use of fuels with high sulfur content, nox adsorber regeneration system malfunction. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Reduced engine power
- Check Engine light comes on
- Unstable engine idling
Causes
- Use of fuels with high sulfur content
- NOx adsorber regeneration system malfunction
- NOx adsorber contamination
- NOx sensor malfunction
- Problems with the fuel injection system
How to Fix
- Check the quality of the fuel used
- Perform forced regeneration of the NOx adsorber
- Check the operation of NOx sensors and the regeneration system
- If the contamination is severe, replace the NOx adsorber.
- Flush the fuel system
Related codes
Error P2C79 by Vehicle Brand
FAQ
What does the P2C79 code mean?
P2C79 is an OBD-II diagnostic trouble code that indicates: NOx Adsorber - Sulfur Limit Exceeded
What causes a P2C79 error code?
The most common causes of P2C79 include: Use of fuels with high sulfur content; NOx adsorber regeneration system malfunction; NOx adsorber contamination; NOx sensor malfunction.
How do I fix a P2C79 diagnostic trouble code?
To fix P2C79: Check the quality of the fuel used. Perform forced regeneration of the NOx adsorber. Check the operation of NOx sensors and the regeneration system. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2C79?
Yes, but get it checked soon
How much does it cost to fix P2C79?
The estimated repair cost for P2C79 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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