Quote:
Originally Posted by Hondamate
I got a p0420 on my way to work. I think that May be my issue with the poor mpg.
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Maybe. If the honeycomb melted and is clogging the pathway, it sure could impact your mileage. If all it is, is a substrate material which has been "used up", it should have only a minimal impact on MPG. Downstream O2 sensors barely factor into your fuel trims. If you only got p0420 today, I doubt the computer is correcting anything enough to affect MPG.
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'97 Honda Civic DX Coupe 5MT - dead 2/23
'00 Echo - dead 2/17
'14 Chrysler Town + Country - My DD, for now
'67 Mustang Convertible - gone 1/17