Engine Performance problem
1999 Chevy Silverado V8 Four Wheel Drive Automatic 154, 00 miles
Engine light came on and the codes are p1133(o2 sensoe insufficiant switching left bank before converter, just changed and still there?), Po175 fuel trim system rich at upstream o2 sensor right bank, and po172 fuel trim system rich at upsteam o2 sensor left bank(just changed). Should I change them all or do I have a vaccum leak somewhere? If so how do I find it?
have the same problem?
Monday, March 30th, 2009 AT 11:25 PM