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I failed emission test with code P0420 PO300.

Tiny
ANONYMOUS
  • MEMBER
  • 2009 CHEVROLET MALIBU
  • 10,017 MILES
I failed emission test with code p0420 po300 andd
P0101 isit the catalytic converter or oxgen sensor? How much will I have to pay to get it repaired at a muffler shop. Oh no misfire
Thursday, April 11th, 2013 AT 1:07 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need a cat. Get a good quality cat not a cheap one. After it is repaired, it needs to be driven to see if the missfire goes away. The 101 is a mass air flow code but doesn not mean it needs to be replaced. Have it checked first

Roy
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Thursday, April 11th, 2013 AT 1:19 AM
Tiny
RUSLADLC
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Which cat would this be referring to? There's one connected to the exhaust manifold itself on the 2.4l and then there is either another one before the muffler or a resonator. Only saw sensors near the first one.
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Wednesday, August 28th, 2013 AT 4:10 PM

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