P0404

Tests 1 - 3:

Tests 4 - 6:

SYMPTOM
P0404 - EGR POSITION SENSOR RATIONALITY

WHEN MONITORED

SET CONDITION
The EGR flow or valve movement is not what is expected.

POSSIBLE CAUSES
- Wiring harness intermittent problem
- High resistance sensor ground circuit
- High resistance EGR sensor signal circuit
- EGR sensor
- PCM