mq9-reaper

Ok so here's my problem. My 03f20c came to an unfortunate end seizing. Why and how doesn't matter now. The car sat for a couple months and while it was sitting a rat made it its home and gnawed into the main wiring harness damaging and severring a few wires. I purchased an ap2 motor to swap in, it came with its harness (ap2) so we used it in place of the chewed one. Now car starts and runs fine but throws a code for the primary o2 sensor heater (P0135). We assumed a short in the sensor from the so I replace it with a used part, reset ecu, still have the cel.

my questions are is there any conflict with the wiring harness being an ap2 and the ecu being ap1? Any Ideas as to why I am getting this code? Could the rats chewing have shorted something in my ecu?

I've replaced the o2 sensor twice now and still am getting the cell for a bad primary o2 heater.

thank's for the help

mq9-reaper

Nobody?

drhess06259

P0135 code I am guessing I have had this problem for 2 years and can't figure it out yet if ubsearch for it on here u will find a thread that tells u to put two resistors in it and that has fixed most ppls issue the rest needed a new ecu which is my next step I have already put 2 o2 sensors in and the resistors. The resistors made the ecu take a longer time for the cel to pop up but I still get it so other then thouse two options ur out of luck or u can test the voltage of the pinout in the ecu just to doubble check the harness is ok it's pin 16 in the blue connector

mq9-reaper

Thanks it does help a little... I'll check into all that and update with my results

drhess06259

https://www.s2ki.com/forums/index.php?showt...&#entry14680529 read that too

mq9-reaper

so the resistores arent so much a solution as they are a cheaper diagnostic tool than a new sensor to see if it is truely the heater that is bad and not something upstream. correct?

mq9-reaper

update: i've got myself an '00 ecu, purchased from screen name"genetopaz". What needs to be done for it to work? In searching i've found that the keys need to be reprogramed to match the ecu. Is that all that needs to be done? A honda tech at the dealership said that the ecu had to be re-initialized also? Did he mean just reset or does the ecu have to be reprogrammed or something only the dealership can (and charge me way too much to) do?

Whether this is going to solve the O2 sensor thing or not i'd still like to run this computer. I've read on these forums that the '00 and '01 ecu runs a little richer than the 03'ecu that i have, and is a better match for the '04ap2 motor which i am now running.

maybe i should start another topic for this one?

drhess06259

I swapped ecu and it fixed my solution after two years of troubble shooting. To swap it u need to have the ecu reprogrammed to the your key or if u have a key that matches the ecu you can go to ur local hardwear store have a key made without the transponder and hold up a key that matches the ecu next to it when u start it

AVAS

if you connect the o2 sensor harness at the transmission incorrectly. Like when u make a clutch change. Harness to itself instead of to the sensors, connectors are the same. You will burn out the heater driver in the pcm and get a code for it. Only fix is to replace the pcm...

drhess06259

Yes and that is what I did that is why ur supposed to disconnect the battery when working on a car