I just picked up a 06 XLT with 125K that was a bank repo. After 15 minutes of driving the CEL light came on and the code read at local parts counter was 0402 which they said was the EGR system/valve. Any ideas or is this a common thing? What are solutions (cleaning or replace)? Thanks

 

Possible causes
- EGR volume control valve stuck open
- Faulty EGR volume control valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- Faulty EGR temperature sensor and circuit


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