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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 08-26-2009, 07:14 PM   #1 (permalink)
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Outside Air Temperature Sensor

The OAT sensor on my 323i is missing. Worse, there are no wires to connect it to. I can get sensor wires and connectors
(have the part-numbers), but I cannot find where to connect.
Any help?
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Old 08-27-2009, 12:03 AM   #2 (permalink)
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remove the plastic panel and look up in there. the wires probably got ripped out but there still should be some of the wiring harness left to tap in to.
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Old 08-27-2009, 12:14 AM   #3 (permalink)
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The plastic panels (the fender liners) are gone on both sides and no sign of any wires to be seen anywhere.
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Old 08-27-2009, 12:16 PM   #4 (permalink)
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Quote:
Originally Posted by kohlers View Post
The plastic panels (the fender liners) are gone on both sides and no sign of any wires to be seen anywhere.
Blue/Brown & Blue/Red wires on a connector...

**it will most likely run from a point in the harness .... front underside of car, either to the bumper or grill area.
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Old 08-27-2009, 12:45 PM   #5 (permalink)
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There are no wires whatsoever no connector!! The display shows Temp is -40F. A mechanic told me this goes into the computer and that may affect the engine (timing,fuel-mixture) although it runs just fine.
P.S. We have +100F here in Tucson.
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Old 08-27-2009, 12:57 PM   #6 (permalink)
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Originally Posted by kohlers View Post
There are no wires whatsoever no connector!! The display shows Temp is -40F. A mechanic told me this goes into the computer and that may affect the engine (timing,fuel-mixture) although it runs just fine.
P.S. We have +100F here in Tucson.
I don't think so. If u study the electrical circuits, the OAT circuit begins and ends in the instument cluster. Therefore, no bearing on the engine performance.

The DME/ECU brain has it's own temperature sensor that gets it's signals from the engine, along with air temp measurements from the Mass Airflow meter ... definitely not from the OAT

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Old 08-27-2009, 01:11 PM   #7 (permalink)
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Temperature sensor panels

Does anyone know where I can get the replacement sensor panels for the driver side? With the lower clearance, I cracked the panel a couple of winters ago and it finally broke while I entered the garage. The sensor is still good and I duct taped it into the bumper for now. Thanks for your help
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Old 08-27-2009, 01:16 PM   #8 (permalink)
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Thanks a lot! You seem to know everything. I have the Chilton manual and try to find the OAT circuit. I can live without the OAT, although nice to have.
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Old 08-27-2009, 01:42 PM   #9 (permalink)
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Talking here you go...

Quote:
Originally Posted by kohlers View Post
Thanks a lot! You seem to know everything. I have the Chilton manual and try to find the OAT circuit. I can live without the OAT, although nice to have.

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Old 08-27-2009, 07:17 PM   #10 (permalink)
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Thanks. I finally found my wires. Look blue to me. They were tied up with the wire for the horn and hidden way up.

BEEFRANK. I think you talk about the splash-guard or also called Fender liner sitting behind the front bumper. BMW part # is 51718193811 for the left and xxxxxx12 for the right. The OAT is mounted on the left.
At BMW Parts, Porsche Parts, Audi VW Mini Volvo Saab Mercedes Auto Parts - RM European Auto Parts they are about $45 each.
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Old 08-29-2009, 08:38 PM   #11 (permalink)
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Originally Posted by darkhorse737 View Post
I don't think so. If u study the electrical circuits, the OAT circuit begins and ends in the instument cluster. Therefore, no bearing on the engine performance.

The DME/ECU brain has it's own temperature sensor that gets it's signals from the engine, along with air temp measurements from the Mass Airflow meter ... definitely not from the OAT
the instrument cluster communicates with the engine module over the Can bus and I have seen the exterior temp sensor when it reads -40 degrees cause a service engine soon lamp to come on and a fault code stored in the DME. It depends on the year and model and DME variant though.
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