O2 sensor ... One more dumb question

Huw Powell human747 at attbi.com
Tue May 7 19:20:55 EDT 2002


> On a 4 wire sensor , what is the fourth wire for?

Signal ground.

> I know on a 3 wire that one is the signal and the other two are keyed power and ground.

those "other two" are the heater coil.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/



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