Thread: The more i work on my car, the worse it gets, read here.

this is a 00 gtp with sd headers, aeroforce scan gauge, 180k miles.
If you havent read any of my recent posts i have had alot of problems regarding the maf sensor, and now the O2 sensor. Long story short, i have a maf low signal, replaced the maf, replaced the o2 sensor. Checked my readings, it gets voltage in and out of it so im concluding that there is a short to ground. Prior to replacing the O2 sensor, i received another dtc p0142 Oxygen sensor heater malfunction. I replaced the o2 sensor, codes still reappear. So im also concluding that my wiring harness is screwed up somewhere from the engine rubbing on it, or from heat etc. i had my own obd diagnostic, snap on ethos, i get 13.8 mpg on the freeway! my goal is to put on a gen v supercharger with supporting mods and call it a day. What is my next step? taking apart the wiring harness? i might take it to a shop and get it worked on.
my codes p0102 -0142. before it got worse, when it was just my maf sensor, i barely got any kr! like no more than 4, even when i tried to abuse it a bit. but now, when i floor it, it goes nowhere, im losing power as the day goes. my aerforce told me it had 80hp one time! D:
I need all the help i can get. thanks

on the side of where the belt is? ill double check my fuses and they all are fine, i shall check again to make sure though.

Check the IGN1-UH fuse. Its 15amp, in the under hood box.

ive checked that many times, its still good!

Ok. Unplug the MAF. With key at run but engine off, do you have 12 volts on the pink wire in the MAF connector?

yes, i get 12 on the pink, 5 on the yellow. while running, the frequency on the yellow changes, which means the maf is there, working but, the connection between the car and maf isnt going through. some say its my pcm, but thats rare. i wanna get this codes rid off before i do anymore mods.

I'm lookin for a possible connection here. Both O2 sensors have heaters and share that fuse and pink wire along with the MAF. Are we sure about the P0142 code? On a 2000 GTP?

yeah, i have a scanner, and before i got one i got it scanned previously wit that code. ive had it that long that ive memorized it
Maf sensor Low signal and
Oxygen Sensor Bank 1 heater malfunction

P0142 isn't a valid code for a 2000 GTP

I'm seeing P0135 for heater on sensor 1(pre cat) and P0141 for heater on sensor 2 (post cat).

there you go, i apologize, i mixed the code for the maf and the o2 sensor.

im pretty sure i do, when i was looking at my data my with my od2 connected and car running, all of my sensors had a reading, but i noticed that the sensor we are having a porblem with, would run rich 1 sec later, lean, 1 sec rich, 1 sec lean. etc
a parasitic drain check?
brand new battery, no corrosion. ill check later at work today, it should minimal within spec.

i dont think your being a dick at all bill. I did look at the cables, no evidence of corroding in the wire or around it. Im gonna take the harness apart at one point, but at this point, ive noticed this is a circle because the maf and o2 sensor work hand in hand.Going to replace the rear O2 sensor, and check the heater circuit. see how that works, and go from there. From what my people at work are telling me, something is not getting a proper reading therefore, blaming another unit. But i might check out my fuel injectors. This car hasnt been used in over 6 years. The first drove i got, no power but i was getting almost 28 a gallon freeway. Now, after all the tune ups i have given it, i lost all of that. My car also misfires, but according to my ethos, there is no history or records of my car misfiring. Trying to be open minded and solving this issue