Description
Function of the EGR Valve
The Exhaust Gas Recirculation (EGR) valve recirculates a controlled amount of exhaust gas back into the intake manifold. This dilutes the incoming air charge, lowering combustion temperatures and significantly reducing harmful nitrogen oxide (NOx) emissions. A stuck-open EGR valve causes rough idle, stalling, and poor performance. A stuck-closed valve increases NOx emissions and may cause engine knock. Carbon buildup is the most common cause of EGR failure in diesel engines.
Common Diagnostic Trouble Codes (DTCs)
A generic OBD reader displays the standard 5-character code shown below.
- P0401 — Exhaust Gas Recirculation Flow Insufficient Detected (valve stuck closed / clogged)
- P0403 — Exhaust Gas Recirculation Control Circuit / Open
- P0404 — Exhaust Gas Recirculation Control Circuit Range/Performance
- P0405 — Exhaust Gas Recirculation Sensor A Circuit Low (position feedback)
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