2003 cadillac DTS
had cat replaced, 3weeks later code 420 came up, cleared code, came back after 2 weeks, mechanic was going to replace oxygen sensors but didn't get to it and inspection came due so he wiped codes. Now all sensors came back up except cat and evap. Have been trying to get these sensors up for 2 weeks and neither will come up. There are no codes showing.
What can be done?
have the same problem?
Saturday, June 11th, 2011 AT 2:02 PM