OK, my check engine light is on and we (mechanic friend and I) can not seem to figure it out. First off, mods are in sig (+ mil eliminators). A scan shows that both rear 02 sensors are not working. At idle, they will both be a 0 volts, then start acting normal, then go out again. It is showing that those sensors are lean. I know that there is an exhaust leak (not sure where) and that the air filter is really dirty. I plan to fix both of those this week. The exhaust leak could be causing it to read lean at the rear sensors, but any idea why they are kicking on and off? I don't have the error code, but will try to get it in the next few days. Thanks for any input.
Daigosis, Help Please
- Thread starter ArkansasMystic
- Start date
Mine would go on and off before I put in the O2 sims.
Pull the code to make sure what you are dealing with.
Pull the code to make sure what you are dealing with.
flstang65
10 Year Member
i have never used mil's. i have heard mixed things about them. i just use my tuner and turn the rear o2 sensors off manually.
Found out autozone does scans, so I got the code. P0136, shows to be Bank 1 Sensor 2 O2 sensor. The mechanic I had look at it said that there were no rear 02 sensors, which I now know is false, and that was causing the confusion. Looks like I just need the driver's side rear 02 sensor replaced, right? I see that there are 2 different sensors for the 96 cobra, looks like there are 2 different lengths (10.5 inches and 15.75). Which do I need? Where is the best place to get o2 sensors, and is bosch the best ones to go with? Thanks for any input.
AdRock
Member
Before doing anything try this:
Pull the MIL eliminators off and use a good contact cleaner to thoroughly clean out ALL of the connectors. Put some dielectric grease in the connectors and put everything back together. Then reset the ECU and see if the CEL comes back on immediately or after a while.
I say this becuase I had a problem with getting the same code after i put some MIL's on. Once I cleaned everyting and put the dielectric grease in the connections I never had any more problems.
Pull the MIL eliminators off and use a good contact cleaner to thoroughly clean out ALL of the connectors. Put some dielectric grease in the connectors and put everything back together. Then reset the ECU and see if the CEL comes back on immediately or after a while.
I say this becuase I had a problem with getting the same code after i put some MIL's on. Once I cleaned everyting and put the dielectric grease in the connections I never had any more problems.
If you have a problem with B1S2 it shouldnt be a lean condition. Thats what the front O2's are there for. The rear O2's are there only to check the difference after the cats. So, we are either talking about the wrong O2, or the wrong code/code description.
And where exactly is the exahust leak? Yes is could cause an O2 sensor to read lean, but again it wouldnt be the rear, unless you have longtube headers or some funky midpipe. I dont see longtubes in your sig, and I know how the mac o/r h is...I have one.
IF the code is in fact for bank 1 sensor 2, try to clean out the connections like someone else said (its free), if problem persists, go to Ford and get a sensor. 99% of the time, a sensor is bad when it comes to O2 codes.
And where exactly is the exahust leak? Yes is could cause an O2 sensor to read lean, but again it wouldnt be the rear, unless you have longtube headers or some funky midpipe. I dont see longtubes in your sig, and I know how the mac o/r h is...I have one.
IF the code is in fact for bank 1 sensor 2, try to clean out the connections like someone else said (its free), if problem persists, go to Ford and get a sensor. 99% of the time, a sensor is bad when it comes to O2 codes.
If you don't have cats then you need to disable the rear o2 sensors or you WILL get a CE light. If you do a search you can find a schematic for building your own MIL eliminators; costs you about $5 and a trip to radio shack. Or, if you want, you can buy a $400 tuner that'll do the same thing.
Oops, I guess I could have read your original post a little closer. I would second the notion of cleaning up the connections and trying again; if that doesn't work, you could try building your own and see if it helps. Due to the nature of the circuit in the eliminators, I'm not sure how you would confirm that they were good/bad with a meter - perhaps someone who is a little more electronically inclined could shed some light on that topic?
If the circuit within the o2 is bad that would effectively negate your MILs (I think), so by rights you should be able to check resistance across your o2 sensor. My logic is that if the signal doesn't travel through the o2, your computer is just gonna read 0v input from the sensor. Again, i'm definitely not an electronic whiz but this is how it seems to me.
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