Anyone know the thread size of an oxygen sensor?
Decided to change the oxygen sensor on a '92 Bonneville SE for poor gas mileage, and the sensor came out with no threads!
Now I got to tap out the exhaust manifold threads before I install the new sensor.
Thanks for any help.
I think it is M 18 x 1.5 Been a while since I stripped one out.
It makes no sense to retap the threads are still stripped. Helicoil is the only sure fix.
Thanks for the info....
After some digging, I did confirm the thread size to be 18mm x 1.5.
Also found the Heli-Coil repair kit for O2 sensors, but the average cost is about $100! That's a bit steep for a one-time repair! Looked for a place that might rent the kit, but had no luck. I did find a 18.5x1.5mm tap at work, and I lucked-out on this one... Looks like the old oxygen sensor took most of the damage. The exhaust manifold threads were a little beat-up at the top, but once I got the tap started, all went well.
This O2 sensor replacement took a lot longer than I expected, but at least I didn't have to drop the $100 for the repair kit!
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