CODE: 0401 says that I have insufficient airflow in the EGR area. I have had this code for almost a year. I have replaced the EGR valve with a new one, ran a number of different cleaners through the EGR system, cleaned the EGR pipe, checked the EVAP container, checked for bad vacuum hoses and have been saying my prayers. Still the code is there and I now think that maybe it is a bad or intermittent electrical part. Maybe it is the VSV-vacuum switch valve? It is an AC Delco Remy 201. It runs about $20.00. Maybe the ECM is bad in putting out EGR signals? Does anyone have any other ideas? My gas mileage is down to about 10 mpg and I am going through oil like crazy. Thanks.
Friday, April 8th, 2011 AT 9:29 PM