P2C7A

SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 2

Severity

🔴 High

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$39–278 (est.)

Symptoms

Check Engine light comes on
Increased fuel consumption
Reduced engine power
Possible ammonia smell from the exhaust system
Errors related to the SCR system

Causes

Contaminated or damaged SCR catalytic converter
Poor quality or lack of AdBlue reagent
NOx sensor malfunction
Problems with the urea dosing module
Clogged SCR system injectors

How to Fix

Check the level and quality of AdBlue reagent
Carry out diagnostics of NOx sensors
Clean or replace SCR catalytic converter
Check and, if necessary, replace the urea dosing module
Clean or replace SCR system injectors

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