P0401

EGR Flow Insufficient Detected

P0401
EGR Flow Insufficient Detected
Not urgent
Ranked Possible Causes
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What You'll Notice

Engine pinging/knocking under load, Rough idle, Possible slight power loss, CEL on

Cost Estimate
JobRange
EGR valve/passage cleaning (DIY)$20–$50
EGR valve replacement$150–$400
EGR tube/cooler replacement (shop)$300–$700
Parts You Might Need
• EGR valve
• EGR gasket
• EGR cooler

These percentages are general patterns, not a diagnosis for your specific vehicle. Have a technician scan your car to confirm which component is actually failing.

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