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Old 02-19-2008, 08:25 AM   #1 (permalink)
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O2 sensor question

How many O2 sensors does my '89 pickup have?
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Old 02-19-2008, 08:31 AM   #2 (permalink)
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One for federal models (not sure about California ones) usually located in front exhaust pipe near catalytic converter (you know the part thiefs love to steal). Replace with genuine Denso or NGK,read below for full details:


The oxygen sensor is replaced for free in the USA only when the vehicle reaches it's first 80 000 miles regardless of the age & number of owners as stated in the factory owner's manual in the maintenance section, some Toyota dealerships are reluctant to replace it for free if that happens contact the Toyota regional head office for your region where they will give your local dealership 48 hours to comply.
On average the oxygen sensors should be replaced every 6 years or 100 000 miles or so which ever comes first as stated in the owner's manual, warranty booklet and factory service manual.

Symptoms of a bad o2 sensor are poor gas mileage, hesistation in acceleration, worse emissions, and in severe cases after the stat opens the engine can no longer maintain stable 750 rpm (with manual 5 spd tranny) idle and the engine begins to stall.

The 02 sensor is designed to function once the vehicle has warmed up which is about after 10 minutes where the thermostat begins to open at 190 or 195 degrees Ferenheit depending on thermostat then the vehicles ECU system enters what they call a "closed loop system" then the exhaust manifold's temperature reaches 400 degree Ferenheit (I think)that's where the sensor starts to do it's job which is usually when the thermostat first opens up then the oxygen sensor senses the ratio of air to fuel and sends a signal back to the ECU then ECU compensates by increasing or decrease the open time for the fuel injectors to pump fuel.

So usually the problem of stalling shows up after about 10 minutes of driving or so. Many folks think that the o2 sensor is bad but an exhaust leak can cause excess oxygen to enter the exhaust system thereby fooling the sensor into thinking there is too much oxygen, there are other problems that could cause it to give false reading such as a vacuum leak.

If you discover that the o2 sensor is bad and it is not under warranty then from my/others experience/research purchase an o2 sensor in the following order:

1)Toyota (NipponDenso now called Denso)
2)Denso aftermarket (Same as original but sold aftermarket)
3)NTK (oxygen sensor division of NGK)

Available at:

http://www.1sttoyotaparts.com/partscat.html (10% shipping by Fed Ex or free shipping with $100 & over speak to Roger at 1-888-271-3948)
http://www.toyotadiscountparts.com (free shipping with $100 & up)
http://www.toyotapartsandservice.com (part # lookup)
http://www.densoaftermarket.com
http://www.densoproducts.com
http://www.ngksparkplugs.com (use coupon code "dodgetalk" to get extra 10% off)
http://www.rockauto.com
http://www.toyotaownersonline.com/pu...arkplugs06.pdf

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Old 03-10-2008, 08:28 AM   #3 (permalink)
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how can I tell if I have a california model?

Thanks
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Old 03-10-2008, 10:48 AM   #4 (permalink)
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Not to hijack but I got a question about the o2 sensor, does the Cat have to be in good working order for the O2 sensor to operate properly? Mine was all broken up inside so I just emptied it out and reinstaled it.

Greg G
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Old 03-10-2008, 08:40 PM   #5 (permalink)
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Quote:
Originally Posted by sometoyotaguy View Post
how can I tell if I have a california model?

Thanks
Usually the valve cover will be have a sticker in the front labeled "22REC" also the emissions sticker will have the California emission specs stickers.Finally the California model ones will have an extra charcoal canister,see the free factory service manuals below:
In North America the 22R & 22R-E s are used in the following:

22R
1981-82 Toyota Corona
1981-83 Celica
1981-87 Toyota pickup (up to 1990 on 2wd)
1984-87 Toyota 4-Runner

22R-E (22REC=California emissions=extra charcoal canister)
1983-85 Celica
1985-95 Toyota pickup
1985-95 Toyota 4-Runner

22RTE (Turbo EFI)
1985-87 Toyota pickup
1985-87 Toyota 4-Runner

Any Public Library in your area would have the Factory service manual, Haynes,Chiltons,Mitchells,Clymers, Bentley and Toyota repair books.For the Dartmouth/Halifax area:

http://www.halifaxpubliclibraries.ca...nt/view/29/49/
http://find.galegroup.com/menu/start...main&prod=CHLL
http://www.chiltonlibrary.com/Index.aspx

Free AutoZone service manuals at:

http://www1.autozone.com/servlet/UiB...pair_guide.jsp

1)buy a used one off e-bay
2)some Toyota dealerships may give you one or sell it for $10-20 (used) as most Toyota dealerships don't repair many old Toyotas and no longer need the service manual
3)some public libraries sell their old books as they are not in demand any longer
4)some free buy & sell classified papers, websites and bulletin boards may have some used ones for sale
5)some junk yards may have one laying around
6)some Toyota specialty garages may have one laying around and no longer use it as the vehicle may be too old and those mechanics probably have so much experience that they could publish their own factory service manual with corrections and "real world repair tips"
7)if someone has the FSM maybe they could scan all of the pages and post it on a site for all of us to download or view.

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Last edited by TrailDust; 07-13-2009 at 12:51 PM. Reason: Factory Service Manual links deleted.
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Old 03-10-2008, 10:24 PM   #6 (permalink)
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O2

Sorry to hijack, but I have a question for Sidney.

Do you have a document that states the O2 sensor will be replaced for free in the USA?

I contacted my local dealers and they stated they've never heard such a thing. They gave me the Toyota regional head office. I called and they also stated that is not true.

Who knows.....
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Old 03-11-2008, 05:56 AM   #7 (permalink)
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Quote:
Originally Posted by ToyoZone View Post
Sorry to hijack, but I have a question for Sidney.

Do you have a document that states the O2 sensor will be replaced for free in the USA?

I contacted my local dealers and they stated they've never heard such a thing. They gave me the Toyota regional head office. I called and they also stated that is not true.

Who knows.....

Like I stated in the first reply to this thread it's stated in the owner's manual under the maintenance section,I have read LOTS of threads about this free O2 sensor replacement from several different members in many 4-Runner/pickup dedicated discussion sites.If it's not listed in your owner's manual then your year may not qualify but I believe most do.

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Old 03-11-2008, 07:44 PM   #8 (permalink)
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O2

Got it, thanks!!!
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Old 02-07-2010, 12:17 PM   #9 (permalink)
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My 1990 Toyota 4WD Pickup has two O2 sensors, one in front and one in back of the C converter. Parts stores, including Toyota Dealerships refer to them as front and back or upstream and down stream. But my engine check system tells me there's a problem with the "main" sensor, and refers to the other as the "sub". Which is which? Is the main in front or in back?
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Old 02-07-2010, 01:24 PM   #10 (permalink)
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The main 02 sensor is the front one, it is used to control the air to fuel mixture. The 2nd one is there to make sure that the catalytic converter is working correctly.
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Old 02-07-2010, 02:28 PM   #11 (permalink)
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Quote:
Originally Posted by mpdxtreme View Post
...does the Cat have to be in good working order for the O2 sensor to operate properly?

Greg G
Short answer: No.

Last edited by motorbreath777; 02-07-2010 at 02:32 PM.
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Old 02-08-2010, 03:25 AM   #12 (permalink)
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wow thread revival. oh how i miss sidney
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1992 Hilux 4X4 22R-E Manual, LCE Headers, Epn cam, super 40, and revirginized.


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Old 02-09-2010, 06:05 PM   #13 (permalink)
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Thanks for the reply V62WDLongbed.

On a maybe related topic, my engine check system indicator sometimes goes on, but then goes out before I can get home and check it, and it’s not supposed to do that until being re-set. Every time I have been able to check it, the code has been the main O2 sensor. I wonder if the problem might be in the ECM instead of the O2 sensor itself, but the ECM is listed as a possible cause for EVERY check code.

Has anyone else experienced this?

This is my first engine with a check system, so I’m just happy that I have an engine that’s trying to tell me what’s wrong. I used to have 83 and 84 22R longbed pickups that didn’t tell me squat. They were both stolen eventually.
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Old 02-10-2010, 07:08 AM   #14 (permalink)
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The check engine light will go on and off like that when the o2 sensor is starting to go bad. Swap it out with a Denso unit. Stay away from Bosch. Changing mine gave me quite a boost in MPG as well.
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Old 02-10-2010, 11:11 AM   #15 (permalink)
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Quote:
Originally Posted by sometoyotaguy View Post
The check engine light will go on and off like that when the o2 sensor is starting to go bad. Changing mine gave me quite a boost in MPG as well.
That has been my experience as well, although I only have the one O2 sensor. After swapping out the sensor my mileage remained the same.
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