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Where's my oxygen sensor? 200 1993

Okay, I expect that I'm going to be ribbed mercilessly for not seeing such an obvious thing, and my only excuse is my age, but....

Folks, where's my oxygen sensor? I've looked all over the exhaust manifold (even have the "shield", for the notorious hot air duct, removed), and the header/downpipe all the way to the cat. It's on ramps right now (to open the coolant draincock), so I'm all over the underside as well as the topside views. No oxygen sensor, and no dangling wires (cut off by the previous owner?) either. But you'd think it's there and working, because I passed my last emissions test.

It struck me that I haven't seen it (it's not ready to be changed -- inspection isn't for over a year -- but I'd like to know for the future), but it has to be somewhere.

Thanks, folks.

BTW, this is a 1993 B230-L, automatic trans., non-california variety.






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