Oxygen Sensor Stripped! Help!!!

M18x1.5, which is the same as large spark plugs.

||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. || || || || ||

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.

FYI, the new AC Delco Sensor has a very fine coating of a graphite and glass bead anti-seize. I read on another web site that standard anti-seize compounds should not be used because the sensor needs a path to ground thru the exhaust manifold, and a "liquid" anti-seize may interfere with the path and cause false readings???