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Old 07-19-2012, 03:23 AM   #1 (permalink)
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P0420:catalytic converter or O2 sensor?

Code:P0420
If I drive crazily(not gently, for example, push hard the accelerator pedal), check engine light will off by itself after driving several miles.
So, the problem is the catalytic converter or O2 sensor? Which one should be replaced first?
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Old 07-19-2012, 12:59 PM   #2 (permalink)
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My money is on the cat. How many miles is your car?

If you have both P0410 and P0420, then I would replace the sensor first to see if it will get rid of the cat code as well. But I would love to hear what other more knowlegeable people have to say. I'm here to learn as well.
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Old 07-19-2012, 10:09 PM   #3 (permalink)
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140K on my car. Just P0420. So I decided to replace cat at first.

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Originally Posted by sprtent View Post
My money is on the cat. How many miles is your car?

If you have both P0410 and P0420, then I would replace the sensor first to see if it will get rid of the cat code as well. But I would love to hear what other more knowlegeable people have to say. I'm here to learn as well.
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Old 07-21-2012, 12:03 AM   #4 (permalink)
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I had the P0420 code and called AcuraCare. warranty extended to 120K miles. They replaced the Cat. Problem solved

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Old 07-22-2012, 04:33 AM   #5 (permalink)
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Unfortunately, mine is 132K
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Originally Posted by jasepb1120 View Post
I had the P0420 code and called AcuraCare. warranty extended to 120K miles. They replaced the Cat. Problem solved

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Old 07-22-2012, 08:34 AM   #6 (permalink)
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Check ebay for some decent prices, $150-$250, on bolt-in replacements.

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Old 12-10-2012, 11:06 AM   #7 (permalink)
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do acura warranty cat converters on 2003 mdx's? anyone have a link?
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