P20F2

SCR NOx Catalyst Efficiency Below Threshold Bank 2

Severity

🔴 High

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$167–889 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Possible transition to emergency mode
Increased fuel consumption
Unusual odors from the exhaust system

Causes

Clogged or damaged SCR catalyst
Problems with the urea injection system (AdBlue)
NOx sensor malfunction
Poor quality or lack of AdBlue reagent
Problems with SCR control electronics

How to Fix

Check the level and quality of AdBlue reagent
Diagnose the urea injection system
Check the condition of the SCR catalyst
Test NOx sensors and their wiring
If necessary, replace the SCR catalyst

Related codes

P20EE P20F0 P20F1