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Re: Nothing else better to do??? (archive)

[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]

Posted by David F on April 05, 2001 at 08:16:46:

In Reply to: Nothing else better to do??? posted by Thomas Meacham on April 05, 2001 at 05:21:22:

Going from sketchy memory here, but the 12 volts is for the heating element in the sensor to aid in warm-up. I believe this function is controlled by a relay.

I am looking at the connector for the O2 sensor. It's a 4 wire unit so there is supposed to be 12 volts for power plus signal plus ground. With the key in the ON position, but the engine not running, I do not have the 12 volts. Is this normal? Will the 12 volts come active once the engine is started. I there a bad relay?

I will really appreciate this info.

Best Regards,


1988 735i 100,600 miles

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