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brythefly · 08-05-2007, 07:11 PM

thanks alot coed, you've been a big help. The truck is throwing a code, and yes 21 is an o2 sensor. Im not too concerned about the loss of low end power at the moment, i just really want to fix my mileage.

My gas mileage dropped from 17mpg to about 12mph.
Is this from the muffler, larger pipe size, or removing the cat... or a lil of all i guess.

08-05-2007, 07:11 PM	#13 (permalink)
brythefly Registered User Join Date: Aug 2007 Location: Colorado Posts: 22	thanks alot coed, you've been a big help. The truck is throwing a code, and yes 21 is an o2 sensor. Im not too concerned about the loss of low end power at the moment, i just really want to fix my mileage. My gas mileage dropped from 17mpg to about 12mph. Is this from the muffler, larger pipe size, or removing the cat... or a lil of all i guess.