p0401
Moderate
Mitsubishi · Sedans & Cars
Exhaust Gas Recirculation (EGR) Flow Insufficient
Quick Answer
Error code P0401 on your Mitsubishi Sedans & Cars means: Exhaust Gas Recirculation (EGR) Flow Insufficient. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Inspect EGR valve for carbon buildup
2
Check EGR vacuum hoses
3
Test EGR solenoid operation
4
Clean EGR passages if clogged
5
Verify EGR flow with diagnostic scanner
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
EGR valve
EGR solenoid
Vacuum hoses
Carbon cleaner
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