O2 sensor problem...

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GTonTheRoad

New Member

Apr 4, 2005

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Apr 4, 2005

#1

• Apr 4, 2005

• #1

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.

 

jaidedeye

Member

Apr 4, 2004

627

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16

Goldsboro nc

Apr 4, 2005

#2

• Apr 4, 2005

• #2

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

 

G

GTonTheRoad

New Member

Apr 4, 2005

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Apr 4, 2005

#3

• Apr 4, 2005

• #3

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

Click to expand...

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

Mar 31, 2005

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New Jersey

Apr 4, 2005

#4

• Apr 4, 2005

• #4

GTonTheRoad said:

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.

Click to expand...

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

Apr 4, 2004

627

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16

Goldsboro nc

Apr 4, 2005

#5

• Apr 4, 2005

• #5

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

Apr 4, 2005

735

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Sacramento

Apr 4, 2005

#6

• Apr 4, 2005

• #6

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..

 

G

GTonTheRoad

New Member

Apr 4, 2005

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Apr 4, 2005

#7

• Apr 4, 2005

• #7

Thanks for all the help guys, I appreciate it. Looks like the problem is in the wiring or the computer..which would suck pretty bad. Anyways, thanks again.

 

9

98laseredgt

New Member

Jul 16, 2004

122

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indianapolis

Apr 5, 2005

#8

• Apr 5, 2005

• #8

i thought bank 1 sensor 1 was the precat passenger side sensor. thats what the guy at autozone said. i could be worng though, havent looked into it yet.

 

sgarlic

Founding Member

Apr 21, 2001

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Apr 5, 2005

#9

• Apr 5, 2005

• #9

Bank 1 Sensor 1 is the passenger side before the converter.

 

9

98laseredgt

New Member

Jul 16, 2004

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indianapolis

Apr 5, 2005

#10

• Apr 5, 2005

• #10

not to hi-jack, but would a bad heater circuit be just the sensor or the wiring?

 

sgarlic

Founding Member

Apr 21, 2001

3,085

1

56

Apr 5, 2005

#11

• Apr 5, 2005

• #11

Seems like people getting those codes are usually due to wiring.

 

jstreet0204

Active Member

Jun 26, 2003

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Winston Salem, NC

Apr 5, 2005

#12

• Apr 5, 2005

• #12

Bank 1 is the passenger side, and yes this sounds like a wiring or connector issue.