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Celica
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Discussion Starter #1
I just bought an 81 celica ST. Yesterday after running some erands I parked my car for like 30 minutes, when I started it again to go to class the sensor light was on. I searched this forum to see if anyone else had commented but I couldn't find any threads. It's a really old car so I'm not suprised but I was just wondering if there is anyway to get around buying a new O2 sensor (they're fairly pricey if I remember right). I only have to pass emissions for one more year but I want this car to last too, it's only got 130,000 miles. I know I can reset the sensor but I'd kind of like to fix the problem. Thanks for any help.
 

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5M-GE
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O2 sensors aren't awfully expensive. $40 tops?
 

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Celica
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Discussion Starter #4
does replacing the O2 sensor make a big difference in the performance of my car, am I losing efficiency or doing any damage by ignoring the light? I just want to keep this car in the best shape that i possibly can. Thanks for your comments.
 

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Cars that old have O2 sensors?

O2 sensors make sure the car is running efficiently as possible.
When the car can't read one, it'll go into open loop and dump extra fuel into the cylinders, making it run super rich. So yeah, you would fail emmisions (unburned fuel, aka HCs) your milage is halved ($$$), and you'll lose performace (inefficient combustion)

Buy a new O2 sensor from autozone or something, you can get the ones that do not have wiring harnesses (those with cost way more) and solder it in yourself

Alternativly (and risky) figure out the impedence the O2 sensor is supposed to read and solder in a resistor inplace of it.
 

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Celica
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Discussion Starter #7 (Edited)
thanks, I just checked there and they want 120 for it. it's listed under "fuel injection" and the 22R is carburated, so.... :dunno:. thanks for the link anyway, it's a handy site to know about.
 

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Celica
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Discussion Starter #8
ok, just checked under the hood and there is already a newer sensor in there, I just remembered, when I cleaned out the trunk after I bought the car the old one was back there. So, should I still get a new one or is there a way for lme to check the wiring or what, it's kindof disconcerting concidering I know that the sensor for sure isn't working, my engine is running pretty rich. oh, and i used a different approach to get into that site i was referred to earlier and found an o2 sensor for 30 bucks, thanks agaion for the reference.
 

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Celica
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Discussion Starter #9
Another update...

I bought an o2 sensor at napa (it's a bosch sensor) and installed it yesterday. my engine is running much better now but how do I get the sensor light to go off. In my repair manuel it says something about a counter that turns it on every 30,000 miles and needs to be reset but it's not where the manuel says it is (under the drivers side dash mounted on the upper part of the brake pedal. just wondering if anyone else has dealt with this on a 22R and how they got the light to go off (i tried resetting it by disconnecting the battery for a few minutes but this accomplished nothing). Anyway, any ideas?
 
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