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Just to be sure, make sure you have a 930/20 engine. The engine number will be stamped in the right hand side of the case, to the right and towards the bottom of the cooling fan. It's a little hard to find, so grab a flashlight and start looking. If you have a 930/20, there was never an O2 sensor. If it is another engine type, you may have had a sensor and a previous owner may have removed it.
Only one way to know for sure.
JR
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