P0400
Medium severityEGR Flow Malfunction
Quick answer
P0400 (EGR Flow Malfunction) means: A fault in the exhaust gas recirculation (EGR) system. Plan a workshop visit. Typical Malaysia repair cost: RM200–RM800 (approximate).
Symptoms
- •Rough idle
- •Pinging/knock
- •Check engine light
Likely causes
- •Clogged EGR passages
- •Faulty EGR valve/sensor
Can I drive?
Plan a workshop visit.
Estimated repair cost (Malaysia)
RM200–RM800 (approximate)
This is general information, not a diagnosis. AutoMalaya OBD helps explain your car’s actual scan data; a qualified mechanic may still need to inspect the vehicle.