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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 09-24-2007, 03:39 PM   #1 (permalink)
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Outside Air Temperature Probe...

I bought a replacement one as the OBC display reads '160' all the time. No change.

What else can I check to get this working, and does it in any way affect engine performance?
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Old 09-24-2007, 06:23 PM   #2 (permalink)
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OBC Temp

Check the wiring all the way back from sensor to OBC. I have found that bad conncectors at the sensor can cause problems and I have built a few of my own using male/female bullet style connectors and crimping them on the wires.
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Old 09-25-2007, 09:36 AM   #3 (permalink)
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I've followed the line back to the firewall. Coming off this line and underneath the fuse box I found a connector, similar to the plugs that attach to the probe, that is not plugged in. I don't know if this is related to this problem, but I cannot locate where this harness plugs in.
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Old 09-26-2007, 09:46 AM   #4 (permalink)
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Obc

Wiring diagram here:
http://shark.armchair.mb.ca/~dave/BMWe30/
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Old 09-26-2007, 09:48 AM   #5 (permalink)
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OBC makle that:

E30 (1983 to 1992 3 Series) Wiring Diagrams
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Old 09-26-2007, 10:34 AM   #6 (permalink)
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Awesome. Thanks.
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Old 09-26-2007, 12:16 PM   #7 (permalink)
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Obc

No problem, glad to help, and the wiring diagrams are pretty important and I just happen to have them saved in my PC, pass them on as you see fit.
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