P20F3
SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 2
P20F3 is an OBD-II diagnostic trouble code meaning: SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 2. Common causes: clogged catalytic converter, faulty urea injection nozzle. Estimated repair cost: $56–278.
Symptoms
- Increased urea consumption (AdBlue)
- Check Engine light comes on
- Reduced engine power
- SCR system error message appears
- Unpleasant exhaust smell
Causes
- Clogged catalytic converter
- Faulty urea injection nozzle
- Problems with NOx sensors
- Poor quality or lack of urea (AdBlue)
- SCR control module malfunction
How to Fix
- Check the level and quality of urea (AdBlue)
- Diagnose the operation of the urea injection nozzle
- Check the condition of the catalytic converter
- Test NOx sensors and their connections
- Update or reflash the SCR control module software
Related codes
Error P20F3 by Vehicle Brand
FAQ
What does the P20F3 code mean?
P20F3 is an OBD-II diagnostic trouble code that indicates: SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 2
What causes a P20F3 error code?
The most common causes of P20F3 include: Clogged catalytic converter; Faulty urea injection nozzle; Problems with NOx sensors; Poor quality or lack of urea (AdBlue).
How do I fix a P20F3 diagnostic trouble code?
To fix P20F3: Check the level and quality of urea (AdBlue). Diagnose the operation of the urea injection nozzle. Check the condition of the catalytic converter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20F3?
Yes, but get it checked soon
How much does it cost to fix P20F3?
The estimated repair cost for P20F3 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat