need help!! po138 code!
03-16-2004, 09:28 AM
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Join Date: Mar 2004
Location: va.
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need help!! po138 code! Two weeks ago ,The car set off the ses light .So I turned on the autotap,Showed h-po138,and p-po138.High o2 sensor voltage!the car seems fine.the only thing that i've noticed is that the gas mileage has gone to hell!!I need to know what i can do about it! 
My mods are vig 3200,nx wet kit,macs with ory,tsp lid,k&n filter,magnaflow muffler.
Since the vig and macs were installed,it has had a problem hunting for idle now and then! Thanks
p.s. the car is a 99 ss a4.
My mods are vig 3200,nx wet kit,macs with ory,tsp lid,k&n filter,magnaflow muffler.
Since the vig and macs were installed,it has had a problem hunting for idle now and then! Thanks
p.s. the car is a 99 ss a4.
