Test Description
The numbers below refer to the step numbers in the diagnostic procedures.
- 2
This step verifies that the malfunction is present. - 3
If DTC P0404 will only set during certain conditions, the malfunction may be intermittent. Refer to DIAGNOSTIC AIDS . If an intermittent wiring problem is not present, test for a faulty connection at PCM or EGR valve. If connections are okay, and if DTC P0404 continues to set, replace EGR valve.