Obd 11 scanner keeps coming up with p0420 code, something keeps triggering the check engine light to come on and have no ides what. Changed spark plugs& wires, replaced front o2 sensor and replaced cat converter. Checked for vac leaks and found none also checked for any oil leaking anywhere and found nothing. What else could be wrong
have the same problem?
Wednesday, February 22nd, 2012 AT 3:10 AM