P20ED

SCR NOx Pre-Catalyst - Over Temperature Bank 1

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 urea consumption (AdBlue)
Unusual odors from the exhaust system
Increased level of NOx in exhaust gases

Causes

SCR temperature sensor malfunction
Problems with the urea injection nozzle
SCR system clogged
SCR control unit malfunction
Damage to the SCR system wiring harness

How to Fix

Check the readings of the SCR temperature sensors
Inspect the urea injection nozzle for blockages
Check the integrity of the SCR system wiring harness
Test the SCR control unit
Replace damaged components if necessary

Related codes

P20EE P20EF P20E9