P2BA6

NOx Exceedance - SCR NOx Catalyst Performance

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unpleasant exhaust smell
Possible transition to emergency mode

Causes

SCR catalyst malfunction
Low level or poor quality of AdBlue reagent
NOx sensor malfunction
Problems with the AdBlue pump or nozzle
Dirty or clogged SCR system

How to Fix

Check the level and quality of AdBlue reagent
Diagnose the operation of the AdBlue pump and nozzle
Check the condition of the SCR catalyst
Test NOx sensors and their wiring
If necessary, replace the SCR catalyst or sensors

Related codes

P20EE P2201 P229F