Im not sure if this is the correct place to post this problem, but I'm new so I'll appologize in advance. The problem I am having is on a 1997 Mustang GT, its completely stock except for some flowmasters. The car has been sitting for a while and after I got it out of storage I went to get it inspected..results...P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1). I called the local Ford house and they advised me my car only had two O2 sensors so I replaced the first two I found..which were the ones after the cats. Two days later I took it back to get inspected and the same code showed up. The guy doing the inspection was pretty much worthless, I tried getting some information out of him but all I ended up with was some brochure in spanish..alot of help that was. After searching around on the net for a while I finally figured out I had two more O2 sensors before the cats up by the manifolds and that bank 1 sensor 1 was the pre cat driver side O2 sensor. I replaced it but im still getting an error code. I've had the codes cleared several times but it keeps returning ...any suggestions? Thanks.
O2 sensor problem...
- Thread starter GTonTheRoad
- Start date
jaidedeye
Member
if your gonna replace one ..you might as well replace all of them.....kinda like changing spark plugs......
also after you replace all the 0-2 sensors check all your wires and connections going to the 0-2's.sometimes the heat from the exhaust can cause wire problems..use some electrical parts cleaner spray and clean the connections out....
keep us posted
also after you replace all the 0-2 sensors check all your wires and connections going to the 0-2's.sometimes the heat from the exhaust can cause wire problems..use some electrical parts cleaner spray and clean the connections out....
keep us posted
jaidedeye said:if your gonna replace one ..you might as well replace all of them.....kinda like changing spark plugs......
also after you replace all the 0-2 sensors check all your wires and connections going to the 0-2's.sometimes the heat from the exhaust can cause wire problems..use some electrical parts cleaner spray and clean the connections out....
keep us posted
I haven't checked the wires yet, that was going to be my next question. Obviously I know where the wires are at the O2 sensor..but where do they go to? By checking the wires Im guessing you mean to make sure that there are no breaks or burn throughs on them right? I guess I would use a meter to check and make sure the circuit is complete..or is there another way to test them to make sure the wire isn't the problem? Also, do you think the computer may be whacked out and thats what is causing the problem? Sorry for all the questions, I've just never had a problem like this before. Thanks in advance for all the help.
blackstalion666
New Member
GTonTheRoad said:
yes the computer may be the problem, we just had a 4.6 t-bird in at work with the same code. and turned out to be the computer. But always check the wiring first. you should have 4 wires going to the o2 sensors, two for the heater circuit and two for the o2 sensor itself. im not sure of what color is what, but ill try taking a look at work and see if i can find a diagram.
jaidedeye
Member
yes, check for cracks in the wire shield and for breaks in the wire itself.......find a schematic for the 0-2 sensore wiring
whyask
New Member
If you have a chilton repair manaul lying around or 15 bucks to buy one it gives you pics and how to's , and even diagrams on were the wires run to..
jstreet0204
Active Member
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