Emissions
Code P0401
EGR Flow Insufficient Detected
Plain English Meaning:Not enough exhaust gas is recirculated
⚠️
Yellow: Drive with Caution
Can lead to engine knock and efficiency loss
P0401 Symptoms
- •Check engine light knocking rough idle
Most Common Causes of P0401
1Clogged EGR valve faulty solenoid
P0401 Repair Playbook
Required Mechanic Tests
A qualified shop should perform these tests before replacing any parts to ensure they aren't guessing:
Command EGR inspect carbon buildup
Typical Fix Paths & Estimated Costs
Clean or replace EGR $150–$600
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Parts for P0401 Repair
Common replacement parts for emissions codes. (Paid links)
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