99 integra-p0171 code wont go away!
 

Wats up...so i have a 99 integra ls sedan with a b20 swap in it...last fall right after i got the car i noticed the factory muffler and midpipe was sagging quite a bit..so i took a grinder and cut it off about even with the rear passenger door..i drove it like this for 3 or days with no cel...then took it to a buddy of mine and he welded a new piece of pipe and a cheap ebay axleback on that i had laying around..all was good til i got about 5 miles down the road from his house and cel came on..it throws codes p0170 and p0171..i have been battling these codes ever since...i have changed fuel filter, plugs and wires, evap sensor on top of the intake manifold, primary o2 sensor and still same thing comes back..car runs fine so this has me stumped...any ideas??

Did you find out what the codes meant before replacing parts?

Re: 99 integra-p0171 code wont go away!
 

Id check for leaks around the intake manifold (vacuum hoses), and check the map and tps sensor.

Re: 99 integra-p0171 code wont go away!
 

I think that code means your muffler bearings are not OBDII compatible