p0401
Moderate
Opel · Sedans & Hatchbacks
EGR Flow Insufficient
Quick Answer
Error code P0401 on your Opel Sedans & Hatchbacks means: 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 deposits
2
Test EGR solenoid operation with scanner
3
Check vacuum lines connected to EGR valve
4
Measure EGR valve opening with scope
5
Clean or replace EGR valve as needed
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 cooler
EGR gasket
Vacuum hose
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