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03 Bonneville 0420 Code

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Old 02-16-2010, 02:44 AM
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Default 03 Bonneville 0420 Code
The Check Engine Light came on and 0420 code is what the computer printout showed. The cat. was replaced 2 years ago. Could it be a sensor? Too much weed or not enough? Ha Ha
The car seems to run fine. Will the light go out if the problem gets fixed?
Stock SE with 186000 miles. Just changed the oil, air and fuel filters.
Thanks
Mike
Last edited by bruzer75; 02-16-2010 at 02:46 AM. Reason: Added trim and mileage
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Old 02-16-2010, 06:33 AM
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It sounds like your o2 sensor is out. Your car will run fine but your mileage will tank.
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Old 02-16-2010, 07:32 AM
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See if this helps any. https://www.gmforum.com/showthread.p...86#post1390979
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