Question about 2007 Chevrolet Malibu SS Sedan New Cars

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My 2007 chevy malibu has its service engine light come on so I took it to AutoZone where they said it was error code 420 which appears to be catalytic converter, misfire, or some vacuum issue. Where can I investigate these codes myself or verify they are really what's wrong?

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Posted on Jan 02, 2017

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SOURCE: 2002 chevy malibu catalytic converter

You probably have way too much unburned fuel in your exhaust system (how's your mileage?) or possibly a failed oxygen sensor that is giving false information to the computer.

Posted on Feb 20, 2009

  • 405 Answers

SOURCE: service engine light

Good Day,

Code P0102 indicates MAF(Mass Air Flow) sensor circuit, low frequency detected

Code P0300 indicates Random Cylider miss fire, meaning missfire in more than one cylinder

The misfire could be a result of the mas air flow sensor being faulty.

Hope this helps for now

Let me know what size motor and if it's 2wd or 4wd and I can get detailed instructions for replacing

Posted on Jul 05, 2008

  • 123 Answers

SOURCE: catalytic converter still glowing red

When running does the engine shake back and forth (indicating a skip in the engine) also does it rev up freely. If you were to rev it up to 3500RPMS would it be smooth without the engine shaking back and forth? Also the o2 sensor on the front of the exhaust manifold is pretty easy to get at, if you were able to pull that( 7/8") wrench I beleive) you could tell if it were running rich (sooty black color). In the end you could take it to a muffler shop and for very little money have them inspect your cat, without any cutting or welding. a $20-$30 cost at most. I know the fixya wants us to be self suficiant but even i don't mess with small exhaust work because of the benieft of not dealing with it, especially for such a small price. But if its something you wanted to do, I could explain so. A shop can visually inspect the cat, and see if it is clogged with oil, or excessive fuel. At any rate in the end if they do find that you do need a cat, don't buy a GM one, there are plenty of other sources for an aftermarket cat. IF you decided to go that route i know of a few sources that one could be had for pretty cheap ($50-70) for new. Let me know if any of this helps

Posted on Sep 15, 2008

  • 8619 Answers



The code means---

Catalyst Efficiency
Below Threshold
(Bank 1)

Please make sure there is no air entering the engine behind the maf, such as a vacuum leak or leaks in ducting between the maf and the throttle body.

If that's no the case then its an issue with injectors clogging and they are not working due to "fretting". This "fretting" is electrical terminals to injectors getting oxidation on them and is fixed by unplugging them and replugging them in. The fix is to put a small dab of die-electric grease on the terminals.

I would suggest an injector service with the new GM procedure using "Top Engine Cleaner". This may be all you need but that P0420 bothers me. P0420, Catalyst System Efficiency Below Threshold, can be set by a poor connection at the PCM or a damaged wiring harness.

Please rate this soluton as FixYa if found useful.


Posted on Mar 01, 2009

  • 362 Answers

SOURCE: where is the 2003 chevy malibu catalytic converter

It is part of the exhaust pipe that connects to the engine.

Posted on Mar 07, 2009

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