Could a sticky EGR valve create a P0470 Exhaust Pressure Sensor Circuit Malfunction? The EGR was replaced under warranty last summer but I don't know how well they cleaned the port. I recently had the ICP sensor and regulator replaced at the dealership and have had my emission light come on again. I can't remember what that code was but he mentioned the MAP sensor but said my turbo was fine. He cleared it out and said to see if it does it again. Of course it did so I borrowed a friends code reader and it showed this error twice. Both times it was very cold out.

 

I would try cleaning the EBP tube first...sometimes they get clogged up. Here's a pic of where it is on an '03:

Page 9: Component Locations

If that didn't work, I'd replace the EBP sensor.

EBP is one of the things the PCM looks at to determine EGR valve operation, but if your problem were a sticking EGR valve I think you would be showing codes to reflect that.

 

Ya, I would do that an clean the EGR valve / plenum also.

I know it was replaced last year.. but lets pull it and see if it has sooted up again.

 

Thanks I'll let you know what I find out, the bad thing is I may not be able to get to it until later in the week as it is going to take awhile to dig out from this trying 3 day storm. Thanks again.

 

My experience is a EGR clean etc. do not always get the "rocks" out of the system...

Stuff ends up going into the plenum, jamming intake / exhaust valves.


Solution for me... I did a bunch of Italian tuneups to dislodge all the crud.