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Old 07-22-2010, 04:18 PM
beardstaff beardstaff is offline
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Location: San Francisco
Join Date: Jul 2010
Posts: 2
Mein Auto: California
E34 540i Where is O2 sensor #2 located? Passenger side or driver side??

I have a 1995 540i E34, with 180,000 miles + the check engine light goes on after driving for about 10 minutes but does not light when I first start car. The stomp test came back with 1212 code, O2 sensor #2.

Just failed smog, check engin light went on, tester staed rich nitrogen output was the problem.

Few Questions:

Since I have two O2 sesor on this car, which one is #2 (driver side or passenger side)?

Besides the O2 sensor what else can be causing this check engine light code 1212?

I have listen for any hissing from engine to see if there were any vacum leaks, and did not hear any.

Once I identify which O2 sensor is #2, I will replace and drive for ahwile to see if the check engine light will register an error and light up. If it does not I will take car in for a smog retest.

Looking to identify which side O2 sensor #2 is located, driver or passenger side to start.

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Old 07-25-2010, 11:12 PM
CDirks's Avatar
CDirks CDirks is offline
Is a real boy
Location: Randolph Center, VT
Join Date: Jun 2010
Posts: 585
Mein Auto: White 1997 328i
Welcome to the 'fest. If you don't get any helpful replies on this forum try posting on the e34 forums if you haven't already. Good luck !
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