P0401 – Exhaust Gas Recirculation Flow Insufficient Detected
- System
- Emissions
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- —
- Applies to
- Generic OBD-II meaning. Not every code is used by this car.
- Description
- Exhaust Gas Recirculation Flow Insufficient Detected
- Detection / symptoms
- 1.Check engine light on
- Possible causes
- 1.The DPFE (differential pressure feedback EGR) sensor is faulty and needs 2.To be replaced 3.There is a blockage in the EGR (tube), most likely carbon buildup 4.The EGR valve is faulty 5.The EGR valve may not be opening due to a lack of vaccuum
- What to check
- 1.Read the code and live data with an OBD-II scanner 2.Look for exhaust or vacuum leaks and check the wiring of the sensor or valve 3.Test the part before replacing it 4.Fix the cause, clear the code and test-drive
- Confidence
- medium (generic OBD-II definition, not checked against the factory manual for this car)
Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights