P0402 – EGR Flow Excessive
Description
The EGR system is flowing too much exhaust gas.
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A diagnostic scanner with live data, freeze-frame information and the right system access can help you investigate the actual cause before replacing parts.
Compare Diagnostic ScannersSymptoms
- Rough idle
- Hesitation
- Poor acceleration
- Stalling
- Check engine light
Causes
- Stuck EGR valve
- Faulty DPFE sensor
- Vacuum leak
- Carbon buildup
- ECU issue
Diagnosis
- Inspect EGR valve
- Test DPFE sensor
- Check vacuum lines
- Inspect passages
- Scan live data
Repair
- Replace EGR valve
- Replace DPFE sensor
- Fix vacuum leaks
- Clean passages
- Update ECU