Oxygen sensor

[SCHMIDT@LNS62.LNS.CORNELL.EDU]

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I'm looking at the possibility of replacing my oxy sensor now that my '89Q-100
has turned 145,000 (very rich combustion products, only 21-22 mpg around town),
but thedealer gave me sticker shock with a $156.00 price quote.

Do I recall correctly that sometime ago there was a thread about using a Ford?
oxy sensor as a replacement??  TIA for any shared insights...

jos