Originally Posted by rizzmonkey
Thanks for your response!
I do have a check light that comes and goes and just pulled it. It is P0404 which has to do with the EGR. This is most frustrating since the EGR valve was replaced about 10 months ago. Also I commented on each of your ideas below.
I sent you a PM.
P0404: EGR Position sensor performance.
Theory of Operation
The EGR valve has a position sensor and the EGR position rationality is designed to make sure that the valve
moves freely within its operating range. Closed valve position reference check verifies that the valve is within its
allowable upper and lower limits. The EGR position rationality test looks for a sustained error relative to commanded
˛ When Monitored:
˛ Set Condition:
The EGR flow or valve movement is not what is expected