P1420
NOx Adsorptive Catalyst System Efficiency Below Threshold
P1420 is an OBD-II diagnostic trouble code meaning: NOx Adsorptive Catalyst System Efficiency Below Threshold. Common causes: worn or damaged nox catalytic converter, nox sensor malfunction. Estimated repair cost: $167–556.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Unusual odors from the exhaust system
- Dips during acceleration
Causes
- Worn or damaged NOx catalytic converter
- NOx sensor malfunction
- Problems with the catalyst regeneration system
- Contamination of the catalyst with sulfur or other substances
- Malfunction of the urea injection system (AdBlue) in diesel engines
How to Fix
- Diagnostics of the condition of the catalytic converter
- Checking NOx sensors and their wiring
- Checking the catalyst regeneration system
- Cleaning or replacing the NOx catalyst
- Checking and servicing the AdBlue injection system (if equipped)
Related codes
Error P1420 by Vehicle Brand
FAQ
What does the P1420 code mean?
P1420 is an OBD-II diagnostic trouble code that indicates: NOx Adsorptive Catalyst System Efficiency Below Threshold
What causes a P1420 error code?
The most common causes of P1420 include: Worn or damaged NOx catalytic converter; NOx sensor malfunction; Problems with the catalyst regeneration system; Contamination of the catalyst with sulfur or other substances.
How do I fix a P1420 diagnostic trouble code?
To fix P1420: Diagnostics of the condition of the catalytic converter. Checking NOx sensors and their wiring. Checking the catalyst regeneration system. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1420?
Do not drive — repair immediately
How much does it cost to fix P1420?
The estimated repair cost for P1420 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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