P2457

EGR Cooler A Efficiency Below Threshold

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Rough idling
Detonation during acceleration

Causes

EGR cooler clogged
EGR valve malfunction
Problems with EGR temperature sensors
Leaks in the EGR system
Cooler tubes are dirty or damaged

How to Fix

Check the condition of the EGR cooler for clogging
Diagnose EGR valve operation
Check EGR system temperature sensors
Inspect the system for leaks
Replace EGR cooler if necessary

Related codes

P0401 P0403 P0404