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check engine light on.

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Old 02-13-2010, 08:54 AM
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Default check engine light on.

and have code on P0420 P0420 - Catalyst System Efficiency Below Threshold (Bank 1). i had taken to ready honda dealership, they checked it gave me bill $ 110. and told me the because of poor gas, the light came on. but i alwys use 91 octane. should put in a new catalyst converter. plz reply thanks. light stays on,will go away for 15 minutes then come back on.
Old 02-13-2010, 03:53 PM
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Default Re: check engine light on.

I always thought that you checked the secondary oxygen sensor first.
Old 02-14-2010, 07:18 AM
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Default Re: check engine light on.

What model and year vehicle is this for?
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