I just had this "check engine light" on in my car. The troubleshooting code is P0420 and the computer gives out a diagnosis of "Catalyst Efficiency low-Bank 1". But since my car only has run less than 80,000 miles so far, it is more like due to other problems than catalyst defficiency. What should I look at to determine the potential problem(s)?
May 29, 2008 at 2:37 AM
