2001 Chevy Malibu codes

2001 CHEVROLET MALIBU
Avatar
MEX1988
  • MEMBER
  • 1 POST
2001 Chevy Malibu 6 cyl Automatic
----------------------------------------------------------------
the codes p420 and p0303 came up what do they mean
Aug 20, 2008 at 10:03 PM
Advertisement
Avatar
BMRFIXIT
  • CERTIFIED EXPERT
  • 19,053 POSTS
P0420 is catalytic converter efficiency low
since you have p0303 which is a misfire on cylinder # 3
I would say fix the misfire first
check it for tune up and check the coil
check for exhaust leak
Aug 22, 2008 at 8:01 AM