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Cleaning an O2 sensor for P0133 850 1995

posted by alschnertz on Wed Mar 20 05:46 CST 2013
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last visit: Fri Oct 24 10:32 CST 2014

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I got a P0133 code the other day. Second time in about 3 weeks.
Correlated with a 4-4-3 and 4-3-5.
So I'm pretty sure it's a Front O2 Sensor.

What are the odds that this is a false reading? Although the car has 215,000 miles, I'm told the O2 sensor was replaced a few times by the previous owner's mechanic. But I don't know if the mechanic at the time was simply throwing parts at the car.

Any chance an O2 sensor can be cleaned?

Another option would be to move it out of the air flow with an anti-fouler. Seen that work on Mazda vans.

--
"Differences of opinions should be tolerated, but not if they're too different" - Sharon Craig

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Cleaning an O2 sensor for P0133 850 1995

posted by Tapsa on Thu Mar 21 06:16 CST 2013
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last visit: Sun Oct 19 13:29 CST 2014

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Hi, have had two 850/94s in my fleet. at 250k km the sportswagon reacted critically slowly in exhaust testing...

I took the sensor off, dipped it over night into carbon cleaner liquid (for one family warming oil pan) and burned it clean with garden grill flame. There after the response in test was perfect.
The sedan (still in family) got the same treatment few yars later and I think I recognized light improvement in mi/gallon, still running the original o2 but only one in the design as N/A engine.
Never rub/scratch the sensor surface.

br tapsa

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Cleaning an O2 sensor for P0133 850 1995

posted by KlausC on Wed Mar 20 10:06 CST 2013
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last visit: Fri Oct 24 10:15 CST 2014

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http://www.volvo-forums.com/index.php?showtopic=19099&hl=o2+sensor

You can move the rear O2 sensor out of the stream, but not the front. Check the wires and look for non-bosh garbage sensor. Also check the elbows for the fuel pressure regulator vacuum line at the fuel rail, any leaks and you will be running rich.

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My name is Klaus and I am a V♂lv♂holic

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Cleaning an O2 sensor for P0133 850 1995

posted by alschnertz on Wed Mar 20 15:31 CST 2013
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last visit: Fri Oct 24 10:32 CST 2014

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Klaus, you're a genius!
Great searching - better than I managed to do.
The kid is on spring break next week and an emissions test is due. It'll be a good time to try this fix.
Thanks.
--
"Differences of opinions should be tolerated, but not if they're too different" - Sharon Craig

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Cleaning an O2 sensor for P0133 850 1995

posted by RepairmanJackal on Wed Mar 20 17:12 CST 2013
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last visit: Tue Jun 10 09:52 CST 2014

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I recall something about cleaning a fouled O2 sensor using a torch.. something in the FAQ, I think.

Doesn't sound like a good idea, really.

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Cleaning an O2 sensor for P0133 850 1995

posted by alschnertz on Wed Mar 20 18:51 CST 2013
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last visit: Fri Oct 24 10:32 CST 2014

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I'm going to try the soak in fuel overnight method. We'll see how well it works.

Also going to try AutoRx and see if it does anything to reduce the oil consumption. Good grief this thing is using a lot. At this point, I don't think it can hurt the engine any. It's kind of funny though, you're supposed to leave AutoRx in for 3000 miles, but when you're using a quart of oil every 800 miles, it won't be in there long!

Contemplating the PCV repair because of the mileage, but since it's not leaking anywhere (excepting the oil cap seal) I've been putting it off.
--
"Differences of opinions should be tolerated, but not if they're too different" - Sharon Craig

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Oil consumption 850 1995

posted by KlausC on Thu Mar 21 09:31 CST 2013
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Before you try AutoRx or some other internal engine cleaner, you might want to do a compression test and see if the rings are leaking. Most likely it is just the valve stem seals or the turbo seal.

If the turbo is leaking a lot into the intake and your car doesn't have an air guide, pull the lower IC hose and see if there is a lot of oil in the tube. The turbo will only 'leak' when it is being used so it will not drip on the driveway. The air guide usually collects the oil and there will be a small oil patch under the car on the driver's side.

A leaky oil cap is a good thing if the PTC is clogged as it will help reduce the crankcase pressure. When you get the car, check both ends of the cams for leaky seals. Put on a new oil cap seal and warm up the engine and test the pressure at the dipstick. The turbo boost gauge will also help as the vacuum reading should move the needle quite a bit at idle.
--
My name is Klaus and I am a V♂lv♂holic

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Oil consumption 850 1995

posted by alschnertz on Thu Mar 21 10:22 CST 2013
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last visit: Fri Oct 24 10:32 CST 2014

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Indeed a compression test is first on the list and I agree that a leaking valve seal is more likely the issue. The car does have a thorough maintenance history of regular oil changes which is why I'm suspecting valve seals more than rings.

I've had the intercooler hoses off and although there was some oil present, it did not seem any worse than I've seen on my 745T. Probably not the best comparison, but a comparison none the less. I'm trying to picture what the "air guide" is. Going to have to look that up. Haven't noticed any stray or spray of oil under the driver's side.

Haven't seen any evidence of cam seal leakage, but haven't really been focused on that either. I probably would have noticed something abnormal when I did the CPS a few months back.

Thanks for the ideas.
--
"Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig

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Oil consumption 850 1995

posted by KlausC on Thu Mar 21 10:37 CST 2013
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last visit: Fri Oct 24 10:15 CST 2014

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Air guide is just the plastic under the bumper, some call it an air dam. The intercooler has a weep hole on the passenger side, and if the turbo is leaking the weep hole will let out hot oil vapors which condensate on the air guide and then the oil runs to the driver's side before dripping to the ground.

AutoRx will not fix valve stem seal leaks. A good and tight vacuum system cause more oil to creep up the valve stems and enter the intake manifold so it gets burned.

A turbo with a bad exhaust side seal will push oil into the exhaust and burn it there, creating a little blue exhaust smoke but nothing like the 700 series white cloud! But that would be enough oil to coat the O2 sensor and mess things up.
--
My name is Klaus and I am a V♂lv♂holic

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