I have tried everything I possibly can to get the P0401 code to stay off and nothing helps. I have changed the egr valve, cleaned the MAF sensor, cleaned the egr lines, cleaned throttle body, checked for power to the egr, changed MAP sensor......... can anyone help??? I needed the car inspected over a week ago.

 

Is the gr valve vacumm operated, I know you stated electricaly checked, but asking?

 

what model year, make and enigne size?

 

You can look up your license plate number on the California DMV website. In the upper left corner of home page, click about, find and search the License Plate Number (LPN) field and also check license plate tracker at http://vinnumberlookup.com/free-license-plate-lookup site. Enter "DMV" in the search box to find all pages on the license plate database containing your LPN."