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Old 02-11-2019, 01:33 PM   #11
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Quote:
Originally Posted by backporch View Post
I may try to break free the oxygen sensors and swap them. Replacment sensors don't look too bad. I checked on RockAuto and they appear to run 25-50 dollars each. Of course, $10 is too much to replace a part that isn't bad.

I am not looking forward to physically breaking them loose. I do have an 02 socket/wrench and some breaker bars. Is the best way to go in from the top or through the wheel well?

Anyone know if it is OK to use a penetrant for the swap? I have only broken sensors behind the cat loose and I did use some penetrant there. usually replaced them at that point.

Also... I noticed RockAuto has two different part numbers for left and right. Could they not be swappable?

I prefer to get at them from under. It usually puts them right in your face. I will get my socket location figured out, run the engine for a bit, bust them loose and then let things cool for a bit.

You can use penetrating oil but I prefer heat.


The different part numbers is because the pigtail lengths are different. They do it so you can't plug them in on the wrong side.
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Old 02-11-2019, 03:09 PM   #12
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Crowfoot wrench can work well on O2 sensors

7/8 or 22mm is the normal size, 7/8 is 22.2mm so either will work fine

The flare nut 6 point crowfoot is better for O2s, doesn't slip off

Last edited by RonD; 02-11-2019 at 03:14 PM.
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Old 02-12-2019, 09:53 AM   #13
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It's possible I got lucky, but I just removed and replaced both my O2 sensors this weekend with no problem. Did it from under the truck. I only have two upstream L/R (pre-OBDII). The one on the right had just enough room for the O2socket but not a ratchet so I slipped a wrench over the end of the socket (the socket has a 7/8 6-point on the end) and it came right out. The left I was able to get the ratchet on and it popped off too. No bashing of knuckles or anything. The new ones had antisieze already on them out of the box so hopefully the next time will be just as easy.
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Old 02-15-2019, 10:15 PM   #14
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havent' looked at the truck till tonight. Started up fine and ran around the neighborhood. Watched the O2 sensor voltage readings on torque.

There were 6 O2 monitors available.
O2 1x1 showed varying voltage between 0 and 1
02 1x2 was the same
02 1x3 no reading

02 2x1 was 0.0 for almost the entire ride, about a couple miles into the 3 mile loop it went to 0.1 back to 0.0. When I stopped the car and let it idle to check something outside, it started to show .3 .4
02 2x2 was steady at 1.2
02 2x3 no reading.

so I guess 02 1x1 is the passenger side forward sensor
02 2x1 is the driver side? reading 0.0 most of the time
02 1x2 is probably the sensor after the cat, not sure what 2x2 is.

The truck has california emissions, so it looks like there are two sensors and two cats before the exhaust combines, one more cat and the final third

This weekend I am going to check the wiring and pull the driver's side sensor
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Old 02-17-2019, 08:12 AM   #15
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Does it make sense that an O2 sensor would read 0.0v while idling for a while and for most of the duration of a very short trip only to start showing a reading just before shutting the engine off?

Asking for anyone's opinion if this points toward a faulty 02 sensor, wiring or ECU.. or indicates that any of those is probably working.
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Old 02-17-2019, 10:00 AM   #16
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Change it out, think about it, you're going to need it/ them anyhow.

O2 sensors go bad,
It's part of the life owning computer controlled cars and trucks.
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