Where are all the o2 sensors located? How many does it have? Add details if necessary please.
What is your question?
Check engine light on after transmission swap. Mechanic says he broke an o2 sensor replacing the exhaust but Didn't say which one or where.
I want to inspect before bringing it back.
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Did. Only found 1 in front of cat
It is NOT OBDII , so that is IT.
Awesome. To clarify: So The OBD1 version of my van only has 1 O2 sensor? Located before the cat?
Yes , OBDI does not monitor the cat function , and that is all the secondary sensors do.