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P0401 Code — Meaning, Real Fixes & Costs | MyCarFault
P0401
🟡 Medium Engine system

P0401 — EGR Flow Insufficient

3 Driver reports
3 Solved cases
3 Verified fixes
0 Wrong repairs reported

Most Verified Fixes for P0401

Ranked by confidence score — same vehicle matches weighted higher.

P0401 EGR flow insufficient: 1) Remove and inspect EGR valve — heavily carboned valves cannot close fully or open properly. 2) Clean with carb cleaner and steel wire brush. 3) Check EGR passages in intake manifold — often blocked with carbon. 4) Test EGR 0%
0 worked · 0 total votes · ⚪ Unverified
P0401 = EGR system not flowing enough exhaust gas. 90% of the time this is carbon buildup blocking the EGR valve or passages. Solution: Remove EGR valve and clean with carb cleaner and a small wire brush. Clean EGR passages in intake manifold. Takes 1-2 h 0%
0 worked · 0 total votes · ⚪ Unverified
EGR valve completely clogged with carbon. Removed and manually cleaned with wire brush and carb cleaner. Also cleaned EGR cooler passages. P0401 resolved. Cleaned at 90000 miles — should have been done at 60000. 0%
0 worked · 0 total votes · ⚪ Unverified

Driver Reports — P0401 3 reports

🟢 SOLVED 80% Ford Transit 2016 2.2 TDCi EGR valve fault
Ford Transit 2016 👁 1,201
🟢 SOLVED 80% P0401 EGR Flow Insufficient Detected — Carbon Fix
👁 1,004
🟢 SOLVED 80% P0401 EGR Flow Insufficient — Carbon Cleaning Fix
👁 836

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