2002 Chevrolet Impala obd code p0420

2002 CHEVROLET IMPALA
189,000 MILES • 3.8L • 2WD • AUTOMATIC
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BASETECH
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  • 2 POSTS
Just had the catalytic converter replaced yesterday, and after 30 or so miles the check engine light came back on, my obd reader gave me the code of p0420, NOW what do I need to get fixed/replaced?
Mar 9, 2014 at 1:41 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
take it back to where it was fixed as that is a converter code so ther eis probably an air leak prior to converter. or an electrical issue to O2 sensor
Mar 11, 2014 at 8:34 AM
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BASETECH
  • MEMBER
  • 2 POSTS
Thanks! I took it back and was told it was "most likely" my O2 sensors. Don't you love how car repair is such an exact science with these guys? Appreciate the feedback, thanks again.
Mar 11, 2014 at 6:12 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
sometimes thing like that can go wrong but maybe he overlooked them....
Mar 12, 2014 at 6:33 AM
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