Question

How do I fix my 1999 Toyota Avalon with OBD code p0402? The car won't pass smog

Answer 1

Most likely the EGR valve and its tubing at full of carbon build-up. It will have to be cleaned or replaced.

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