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Old 03-18-2013, 01:19 PM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by poolman View Post
seeing if that cleared everything up--the Trifecta that is
While the BPS error 81 is often implicated in the trifecta, as mentioned in the referenced thread, I don't know of a single case reported here on Bimmerfest where that error code correctly pinpointed the problem.

In fact, I had the error code myself; and it turned out, like all the (known) others, to be a bogus reading, due to the fact that the diagnostic tools just can't tell a bad sensor from a bad computer indication of the sensor reading.

Luckily, you 'can' test the BPS without having to remove it, using just a DMM and a partner, as already explained in the BPS test thread.
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