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Old December 23rd, 2005, 09:13 PM   #1
Skooter_Built
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Default oxygen sensor questions for a 99 TJ

im on a Jeep maintance kick at the moment. Im replacing my cap, rotor, plug wires, spark plugs, and radiator soon. my 99 TJ has about 90k miles and while im gonna do all this, i was thinking about replacing the oxygen sensor. Now my questions are will this help make my Jeep run a bit better, and thus improve milage(im guessing it might but probably very little). Also where are the oxygen sensors located on a 99 TJ, with the 4.0?
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Old December 23rd, 2005, 10:49 PM   #2
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NO need to replace the O2 sensor unless it is pulling a code.
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Old December 23rd, 2005, 11:36 PM   #3
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Not true, if you look in the scheduled maintenance it states that the O2 should be replaced at 60,000 mile increments.
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Old December 24th, 2005, 06:50 AM   #4
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Quote:
Originally Posted by MuddyPaws
Not true, if you look in the scheduled maintenance it states that the O2 should be replaced at 60,000 mile increments.
it also says that fuel filters should be replaced at 30,000 and oil should be replaced at 3,000..

If they could, they would tell you the whole fricken truck has to be replaced at 40,000 miles..

My rover's oil change schedule is every 8,000 miles, so why should't it be like that with every single vehicle? Its called profit.
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Old December 24th, 2005, 10:39 AM   #5
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Quote:
Originally Posted by MuddyPaws
Not true, if you look in the scheduled maintenance it states that the O2 should be replaced at 60,000 mile increments.
Nothing in my FSM about having top replace it. Only change engine oil, filter, air filter, PCV, frt and rr diff fluid, t-case fluid, trans fluid, plugs and on the 2.4L Wires.
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Old December 24th, 2005, 11:26 AM   #6
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In theory, a Bosch heated O2 sensor has an estimated life of about 90k miles, so you're almost there. Over time, the crud in the exhaust builds up on the sensor, making it slower to respond. Thats why the threw the heater on them, to get them up to temp faster and burn off some of the garbage.

Anyways, you might see a slight improvement as far as mileage. Maybe .25-.5 MPG TOPS unless (like said before) you're throwing a code.

Power won't really increase, since when you're at full throttle, the O2 isn't doing anything anyways. Driveability...eh. It might smooth out your warm idle a bit. Maybe make it rev out a little smoother. Doubt it though.

Location...I believe (don't quote me) that your upstream sensor is just past the "collector" where the exhaust manifold meets the cat extention pipe. The downstream sensor will be after the catalytic convertor. All else fails, trace the exhaust system. Guaranteed you'll find them somewhere in there.
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Old December 24th, 2005, 01:12 PM   #7
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i just unpluged my O2 and it never ran better
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Old December 24th, 2005, 01:42 PM   #8
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Quote:
Originally Posted by Jeepinlunatic
i just unpluged my O2 and it never ran better
it goes for a default setting after its unplugged. if its fouled it tries to compinsate witch intern could make it run worse. I think replacing them is fine, no big deal.

by the way nobody noted in here whats the biggest cause of O2 sensor failure..silicone in any form will take out a O2 sensor even if its dried for weeks it burns off and the coats the sensor rendering it usless. so if you have a rig thats wipping them out hand over fist this is the culprit
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Old December 24th, 2005, 01:47 PM   #9
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Quote:
Originally Posted by clarkstoncracker
it also says that fuel filters should be replaced at 30,000 and oil should be replaced at 3,000..

If they could, they would tell you the whole fricken truck has to be replaced at 40,000 miles..

My rover's oil change schedule is every 8,000 miles, so why should't it be like that with every single vehicle? Its called profit.
tj is 7500 miles, IIRC under normal conditions.

I run fully synthetic oils, I have 2,000 miles since my last oil change, and the oil looks great. I also am not hard on it on the street, an have had it off pavement once since officially owning it.

Under dusty, stop and go, or towing conditions, I'd do oil changes sooner, which is also recommended in the owners manual.
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Old December 24th, 2005, 03:31 PM   #10
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Quote:
Originally Posted by Yetti
silicone in any form will take out a O2 sensor even if its dried for weeks
So you shouldn't take a stripper in a TJ?
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Old December 24th, 2005, 03:42 PM   #11
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Quote:
Originally Posted by Yetti
by the way nobody noted in here whats the biggest cause of O2 sensor failure..silicone in any form will take out a O2 sensor even if its dried for weeks it burns off and the coats the sensor rendering it usless. so if you have a rig thats wipping them out hand over fist this is the culprit
I don't get it..

??????
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Old December 24th, 2005, 04:14 PM   #12
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I think your confused...

the silicone I speak of isn't the kind in your girl friends bra. its the type you use for Valve covers and other gaskets. some people have made the mistake of using the stuff on intake gaskets and I even use it on exaust gaskets where its metal to metal, but never on a fuel injected engine. carbed engines it don't matter because theres no sensor in the exhaust. I have seen lots of things cause damage but the stuff you can avoid is easy if you know what not to do first.
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Old December 25th, 2005, 04:04 PM   #13
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Mine threw an o2 code while wheeling, I plugged up the tailpipe a few times backing up. Just a coincidence or could that damage the sensor, maybe sucking some dirt up thru the exhaust?
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Old December 25th, 2005, 04:48 PM   #14
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I would think a plugged pipe would just give an unusual sensor reading and push it out of its preset parameters
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Old December 26th, 2005, 09:15 PM   #15
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My 98 TJ 4.0 developed a stumble this spring which new O2 sensors cured (no codes).

They were a bitch to get out, but it immediately cleared up the driveability issue.

Upstream was in the pipe right after the header/manifold. The downstream was back after the CC before the muffler (above the skid).
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