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Well, within this past week my 99 v6 ATX cougar has been pulling the p0136 code, saying bank 1 sensor 2 o2 circuit malfunction. The thing is i have gutted precats with a testpipe, with MIL eliminators. What i did, thinking the MIL's were bad, i switched them out with the front to the rear, and the rear to the front. 3 days later, i get the same p0136 code. This makes me believe my mils arent bad, but what could be causing this problem. While i was under the car, i traced down the wires, and from what i could tell none looked damaged or frayed, all good condition. My car does have 120k on it, and from the looks of it my front 02 sensor had been changed recently, and my firewall side(the code side) looks like it has seen its better days.
What can be causing me this code? I know it doesnt effect performance or anything, i jsut hate the CEL being on. Could the actual 02 sensor be bad with the Mil plugged into it anyways? Sometimes i smell a funny smell while idling or what not, i think its my exhaust, but i do have no cats and one resonator. How could i get this problem fixed?
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From TSB P0136 - HO2S Sensor Circuit Malfunction (HO2S-12) The downstream HO2S sensor(s) are continuously checked for maximum and minimum voltages. The code will set when the voltages fail to meet the calibrated limits. �· Disconnected sensor �· Pinched, shorted, corroded wiring or pins �· Crossed sensor wires �· Exhaust leaks �· Contaminated or damaged sensor �· Chafed/damaged wiring http://www.v8sho.com/SHO/TSB0197HO2SServiceTips.htm
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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ive already found that, while searching before i posted.
sensor is not disconnected
the pins are not Pinched, shorted, or corroded
there are no crossed over sensor wires
-there may be an exhaust leak, im not sure. I started the car while it was on stands, and crawled under but couldnt find anything resembling a leak... how would i spot one anyways?
-the sensor may be contaminated or damaged, but more than likely contaminated or not working anymore - like i said it may have not been changed in 120k miles
-the wiring is not Chafed/damaged, i followed it up as far as i could, and it is still insulated and in good condition
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You're saying you switched your upstreams in to your down streams, even though you are running catless.
Couple of things, with that:
One: the upstream and downstream are different tolerances and are not interchangeable.
Two: catless operation will definitely throw a code if you tossed some o2's in there.
I'm tired, and I have a feeling I am either missing something, or not seeing something, so feel free to correct me where I made a wrong assumption.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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no! I did not touch the upstreams at all!!
What i did when i went catless, is throw on mil's on the downstream o2 sensors. I have a cougar, and i have 4. 2 per manifold. Since i was pulling a code on the bank 1 sensor 2... the downstream sensor nearest the firewall, i swapped out the mil wit the bank 2 sensor 2 o2 sensor, which is the downstream sensor near the radiator/lower radiator support, hoping the mil was the problem, and when the CEL came back it would show it on a different bank. The code came back to the same o2 sensor... bank 1 sensor 2 near the firewall, after i switched the MIL's
this is why i believe the mils arent the problem, its either in the o2 sensor, wiring, or something else i have overlooked. Does this help clearify ray? But i dont understand if i have a mil on the o2 sensor, how i can still get a cel from it.
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Clarifies it perfectly..
Give me a bit... I'll see what I can't think up.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Swap the O2 sensors this time, not the MILs.
A defective O2 sensor will cause this fault. It is unlikely that the MILs would be responsible.
If the code follows the O2 sensor, you have your answer.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!
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Originally posted by streetrider05:
Sometimes i smell a funny smell while idling or what not, i think its my exhaust, but i do have no cats and one resonator. How could i get this problem fixed?
You may want to try an exhaust leak test.
http://www.thesmokemachine.com/TechTips.html#3.%20Exhaust%20Leaks
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Okay, today i will swap out the o2 sensors and pull the battery cable. If this gives me an alternating code, i have found the problem. If it still gets the same p0136 code, then the o2 sensor is good and i will try the exhaust leak method. Ive searched online to buy these smoking leak testers and they run for over 500 bucks!! I assume i would have to take it to a shop to get done? But first i will swap the o2s and go from there. Ill keep it updated
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Originally posted by streetrider05:
I assume i would have to take it to a shop to get done? But first i will swap the o2s and go from there. Ill keep it updated
Yep.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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