there is a few tests to do to check if the O2 is the culprit or not, I would start by measuring the eha currnt with it plugged in and not. You should be able to tell just by unplugging it.

And yes, the ford O2 works well, I had one in my car for a year now and it does what it's supposed to do.

xp

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1985 190E 2.3L - a constant project.