myws620

OK so the problem is the check engine light came on, after it has been on previously and i fixed the problem (guess not) the previous problems were with the o2 sensor on bank 1 and random miss fires. So i changes spark plugs and replaces o2 sensor, car drove fine for about 350 miles with no check engine light. Then check engine light came on again, these are the new codes p0154, p0300,p0131,p0171. It cant be MAS just had that replaced also. So please help thanks

rpmauto

iTrader: (14)

did you replace the plug wires too, (for the po300 code) if a plug was carbon tracked it will track the boot and that boot will ruin the new plug. I will have to look up the other codes, cant remember off the top of my head

myws620

no i didnt do the wires, but if that was the case wouldnt it be a specific cylinder missfire

myws620

also, i dont know if this has anything to do with it, but when im driving at night the inside gauge light pulse, maybe electical problem?

racecar

OK, tell us what kind of car you have, what year, and what are those codes.

myws620

the car is a 2002 ws6 A4 with headers, other then that stock. the codes are fuel trim bank one conditon running either lean or rich, circuit condition(heated oxygen sensor bank one sensor 1), heated o2-band 1 sensor 1 low voltage, and cylinder misfire detected- random cylinders. those are the explanations for all the codes. i just changed bank 1 o2 sensor. and the plugs but not the plug wires so.... idk maybe those plug wires are messed up

Squirts11

iTrader: (14)

Check these links out:

p0154: http://www.gearchatter.com/viewtopic9159.php
p0300: http://www.gearchatter.com/viewtopic9150.php
p0131: http://www.gearchatter.com/viewtopic9162.php
p0171: http://www.gearchatter.com/viewtopic9154.php

Source: http://www.gearchatter.com/viewforum33.php