Question about 2001 BMW 5 Series

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Ambient Temperature Sensor

Hi. I have a 523i series (1996) whose ATS is reading -40. Can you please advise the exact location of this sensor for repair purposes? Thanks Peter NB: It is badged as an M Series although the steering wheel is not the 3 spoke type.

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  • paddis Jan 21, 2009

    Thanks for your quick response. I found it was located on the underneath of the chasis (protected by plastic cover) beside and to the front of the right hand front wheel. There you go. I also confirmed it is NOT and M series - merely a cheap badge. Thanks.


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Check in front of the radiator, it should be on a small metal bracket, the sensor has 2 wires going to the connector on it..

Posted on Jan 18, 2009

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Sensor Locations.

The Air Temperature Sensor is built into the Mass Air Flow Meter. It is located on the air intake tube, between the air filter box and the metal intake manifold, held on with 2 screws.

The Coolant Temp Sensor is located on the back side of the engine (closest to the firewall), closer to the driver side of the engine. It is close below the Csm Position Sensor, that is located on the cylinder head.

If you had problems with either, the DTC would be P-0115 for the CTS and P-0110 for the ATS.
Note that the ATS cannot be serviced alone, you would need to replace the MAF assembly.
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