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Old 12-11-2008, 06:45 PM   #1
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Exclamation Check Engine Light

my check engine light has been on and off.. i connected my jeep to a code reader and it said "02 Sensor Heater Circuit Malfunction Bank 1 Sensor 2" i went to auto store and bought sensor.. any ideas where this sensor is.. i think its right after cat or right before but im not sure.. thanks guys

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Old 12-11-2008, 07:15 PM   #2
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i believe that is right after the cat. get a second opinion though

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Old 12-12-2008, 05:41 PM   #3
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thanks... can anyone give me a definite answer as to where "02 Sensor Heater Circuit Malfunction Bank 1 Sensor 2"
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Old 12-12-2008, 09:34 PM   #4
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If you go to this link Index of /allmanuals/Jeep/TJ you can download the Factory Service Manual for your year TJ and find it in the manual.
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Old 12-12-2008, 09:46 PM   #5
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My "idiot light" has been on since I bought the Jeep, the guy I bought it from said it has been on for A LONG TIME. He also said that it said something with the Catalytic converter also?? I dont know and havent done anything about it. It went off for a day after we did the tune-up on it after we cleaned out the throttle body but came back on shortly. I just put a piece of black electrical tape over the light so it wasnt glaring at me.....
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Old 12-13-2008, 04:05 PM   #6
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its just the o2 sensor,being it sensor 2 its after the cat.sensor 1 would be precat
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Old 12-13-2008, 04:36 PM   #7
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ohh okkk.. so would i have to drop skid plate to get to this sensor?
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Old 12-13-2008, 07:53 PM   #8
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maybe,being it a 97 and the o2's prob never been touched they might be a pain to get out.you may need an o2 sensor socket as well.its a slotted socket that goes over the whole thing
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Old 12-14-2008, 05:16 PM   #9
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Kinda on topic and you may already be aware of it. But you don't need a code reader to get the code from a 97 TJ. If you turn the ignition switch on and off 3 times within 5 secs. It will display the code on the odometer. It flashes each code 3 times I think. It's extremely handy. Don't know what other year models do this.
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Old 12-14-2008, 08:26 PM   #10
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I just came across this information for those of you who have the check engine light on and don't know why.

Gasoline sold outside of California is permitted to have higher sulfur levels which may affect the performance of the vehicle’s catalytic converter.
This may cause the Malfunction Indicator Lamp (MIL), Check Engine or Service Engine Soon light to illuminate. We recommend that you try a different brand of unleaded gasoline having lower sulfur to determine if the problem is fuel related.
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Old 12-15-2008, 12:43 AM   #11
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well its not gas i tried that one but thanks man.. its def the sensor.. i have the socket but i tried getting it off and its stuck.. i used penetrating spraw and wd40 and nothing worked...
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Old 12-15-2008, 01:06 AM   #12
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Quote:
Originally Posted by Giancarlo View Post
well its not gas i tried that one but thanks man.. its def the sensor.. i have the socket but i tried getting it off and its stuck.. i used penetrating spraw and wd40 and nothing worked...
the best way to get those is using a torch and heat them up (do not melt them though). Also unless you have the proper "o2 sensor socket", dont try it, once you strip it, its gone.

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Old 12-18-2008, 06:02 PM   #13
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i have an 02 socket... the thing wont budge.. im afraid to use heat as i have a rear main seal leak and i do oil in the skid pan and just on parts down there... the part just wont come off
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Old 12-18-2008, 11:16 PM   #14
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one way to identify the sensor i have found is that the plug end of it will only plug into one plug on your wiring harness so it should be easily identified....at least that is the way it is on my 01....heat is not gonna set your jeep on fire....we torch next to gas tanks and such all the time an our jeeps are all still intact.....when you heat it just heat the surrounding metal and not the sensor to get the threads to expand and allow you to break it loose..make sure you put antisieze on your new one in case you ever have to replace it.....always keep a fire exstinguisher on hand though
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Old 12-20-2008, 04:39 PM   #15
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ohh i kno the jeep will be ok but i have a lot of oils tranny and engine all over the t case tranny and pan im just worried... but heat is definitley the best way right?
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Old 12-20-2008, 07:19 PM   #16
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Ya, just let the Jeep run for a while to heat it up.
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Old 12-21-2008, 08:42 PM   #17
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Sensor behind the cat...

... exact same code on my '97 4.0 - I replaced the sensor after the cat and no more problems. (I knew it was this one since I had already replaced the one before the cat when I replaced the whole exhaust system).

I tried everything to remove the front sensor from the old exhaust system - never got it out.... heat, PB Blaster, large O2 sockets (two types), nothing, never got it out. The rear did come out, but only after MUCH soaking with PB Blaster, O2 socket, and a large breaker bar.
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Old 12-23-2008, 06:31 PM   #18
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well doesnt a bad o2 sensor make the engine run richer or leaner which causes poor mpg?
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Old 12-23-2008, 06:53 PM   #19
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Your '97 only has two 02 sensors, one upstream and one downstream. The upstream sensor which is mounted just below the exhaust header is the only one that affects the engine's air-fuel mixture.

The downstream sensor is screwed into the catalytic converter and it only monitors the cat for proper operation. It does not and cannot affect how the engine runs at all. I suspect from your code that it is this particular 02 sensor's heater circuit that is giving problems.

The heater circuit is separate from the 02 sensor itself, it connnects to a small heater inside the 02 sensor's housing. Its job is to speed how fast the 02 sensor starts working when it is cold. A bad heater could be caused by the heater inside the 02 sensor having blown (its like a bulb filament), a damaged heater wire or connector, or a blown fuse. The two white wires (IIRC) are the heater wires, I would measure them at the 02 sensor's plug to see if you're getting 12 volts there. If you are, the 02 sensor's heater is bad. If you're not getting 12 volts there, you either have a blown fuse somewhere or the wiring or plug is damaged.

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