What is this piece on top of manifold called?

2011 BMW 335
119,000 MILES • 6 CYL • TURBO • 2WD • AUTOMATIC
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BHAMDOC1973
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About to reinstall the intake manifold. There is a sensor on the top right of the intake that pops into a grommet which i have lost and i want to try to buy the grommet. Do you know what this sensor is? Temperature sensor maybe? This is a 335d diesel,
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Jun 18, 2022 at 2:31 PM
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SQM
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Hello,

This is the Manifold Absolute Pressure Sensor (MAP).
The MAP sensor sends data to the ECM for it to control air fuel mixture.

You might have to purchase a new sensor as most of the time the grommet is not available by itself.

Let me know of any questions.
Thank you.

Jun 18, 2022 at 4:38 PM
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BHAMDOC1973
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Got it, thanks.
Jun 18, 2022 at 5:01 PM
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BHAMDOC1973
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What does it do? If i just leave it hanging and start the car for now would i get a rough idle? I found the rubber piece online.
Jun 18, 2022 at 5:04 PM
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SQM
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The MAP signals the ECM to help determine how much fuel to provide. So, it will likely run rough and trigger the check engine light.
Jun 18, 2022 at 7:12 PM