O2 sensor location

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Old 05-03-2005, 05:25 PM
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Default O2 sensor location

Where is the O2 sensor
located on an '86 4000S
1.8L 4cyl?
Can't seem to locate mine.
Old 05-03-2005, 05:32 PM
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Default Not sure about the 4cyl

But check on top of your exhaust manifold just forward of the convertor. Mine was just under the rear of the transmission case. You might not be able to see it unless you're under the car (that was the case for me). If all else fails, just examine every inch of your exhaust manifold. It's somewhere there!
Old 05-03-2005, 06:33 PM
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Default pretty sure its on top of the cat

on the 5 cyl you need to separate the cat from the downpipe, I'd bet the 4 cyl is the same. Also, take note of the year of your model - you may have the 1 wire sensor or the 3 wire.
Old 05-03-2005, 06:48 PM
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Default Re: O2 sensor location

I also found this
funny-shaped little
pipe with a rubber cap
attached to the exhaust
manifold. What is that?
Old 05-03-2005, 07:01 PM
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Default

CO test pipe for troubleshooting CIS
Old 05-03-2005, 07:03 PM
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Default I didn't need to (well, couldn't) separate my exhaust from the downpipe

since my flange has been cut off and the exhaust welded to the downpipe =( I did manage to get a 7/8" open end on it and with some PB blaster, it came right out.
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