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Old 12-07-2008, 11:33 PM
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Check Engine light- p0420- Cat replaced twice!

Hi everyone,

I have had my catalytic converter replaced twice and both O2 sensors as well.
I keep getting a P0420 (cat converter below efficiency threshold) code, but everything that needs to be replaced has been replaced.
I have a Magnaflow cat, not OEM, and a shop told me I should replace it with OEM or CarSound brand. What if this doesn't work? They say the high flow Magnaflow isn't efficient enough.

Thanks
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Old 12-07-2008, 11:34 PM
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third time is a charm
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Old 12-07-2008, 11:53 PM
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Put in a simulator and be done with it!
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Old 12-08-2008, 12:53 AM
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Some high flow cats just don't work well enough.... what part # did you get? From what I've heard Carsound cats are the same as Maggies
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Old 12-11-2008, 11:23 PM
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I have had 5 cats replaced while under warranty but I had a generic hi flow put on about 4 or 5 years ago with no problems since. Maybe I got lucky or Dodge used genuine junk brand cats I dunno.
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Old 12-12-2008, 12:57 AM
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Tie the rear most O2 to the framerail, reset your pcm.
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Old 12-12-2008, 01:46 AM
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Thanks
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  #8  
Old 12-25-2008, 12:04 PM
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Quote:
Originally Posted by Five9Dak View Post
Tie the rear most O2 to the framerail, reset your pcm.
JUST CURIOUS WHAT DO YOU MEAN BY TYING THE REAR MOST O2 SENSOR TO THE FRAME RAIL. I HAVE CHANGED OUT BOTH O2 SENSORS AND AM STILL GETTING THAT SAME DAMN CODE. I CHECKED MY CAT AND IT SEEMS TO BE OK. I AM BEGINNING TO WANDER IF HAVING A 180 TSTAT MIGHT BE THE PROBLEM.
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Old 12-31-2008, 04:23 PM
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I also have this code, im thinking of just gutting the cat and going with a simulator and resetting the computer.
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Old 12-31-2008, 04:33 PM
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If you remove the O2 sensor after the cat and tie it to the frame rail, it will always be happy about reading "cleaner" air than the O2 sensor before the cat. No need for a sim.
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Old 12-31-2008, 05:57 PM
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DO you have access to a scan tool that can read running data?

If so look forr the front O2 sensors changing from .900 - .125 at least 6 times in 5 seconds.
The downstream O2 should read between .750-.400 .

I have seen people use a anti fowler for spark plugs on the downstream O2. All you have to do is drill the center out to fit the O2 tip. This takes the Tip of the O2 away from direct contact with the exhaust gasses and tricks the O2 to read slower and more neutral. Thus haveing the computer think every thing is OK.
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Old 12-31-2008, 09:57 PM
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Is the cat the right size? Magnaflow/Carsound (same company) has all of their cats listed for a given engine size, don't want to go overboard.
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