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S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Parktronic sensor, both front and back

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Old Jul 14, 2019 | 01:04 AM
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azontodance's Avatar
azontodance
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Mercedes Benz S550
Parktronic sensor, both front and back
Does anyone knows why my parking sensor doesnt work. Both front and back. 08 S550

The P switch button on the dash stays on Red all the time.
If I press it, it doesn't respond or turn off.
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Old Jul 14, 2019 | 10:54 AM
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dlafever
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'15 S550, '10 E350 P1/P2, '02 ML320
There are several sensors in the bumper and for the early W221s like yours and mine they are actually covered by the bumpers, not like the kind you see on many cars today. There are 4 in the front bumper alone along with the distronic sensor behind the grille. So really you'll need to get your car scanned with a decent code reader to find out which one is misbehaving. That red P switch light is there to remind you they are not working, just like the yellow 'no one is in your passenger seat, so that airbag is turned off' button.
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Old Jul 14, 2019 | 03:49 PM
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2007 S600
What he said. A good M-B specific scanner should tell you which radar sensor is bad. Mine was calling out the right inner front sensor, I replaced that and everything worked again.
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Old Jul 21, 2019 | 09:54 PM
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Mercedes Benz S550
Thank you very much guys. I appreciate you all
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Old Jul 26, 2019 | 06:14 PM
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W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
Originally Posted by azontodance
Thank you very much guys. I appreciate you all
Does your vehicle have Distronic Plus?
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Old Jul 26, 2019 | 06:34 PM
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Mercedes Benz S550
Originally Posted by Polar Bear
Does your vehicle have Distronic Plus?
I have ASSYST PLUS
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Old Jul 26, 2019 | 06:39 PM
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Also -- are there ANY other lights or fault indicators on?

Distronic Plus is the adaptive cruise control. Assyst Plus is the service reminder system. Only the cruise control uses any of the sensors.
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Old Jul 27, 2019 | 12:18 AM
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Mercedes Benz S550
Originally Posted by DaleB
What he said. A good M-B specific scanner should tell you which radar sensor is bad. Mine was calling out the right inner front sensor, I replaced that and everything worked again.
Originally Posted by DaleB
Also -- are there ANY other lights or fault indicators on?

Distronic Plus is the adaptive cruise control. Assyst Plus is the service reminder system. Only the cruise control uses any of the sensors.
No other light is on. and Yes, I have cruise control.

I think I know what the problem is, something is touching by the rear driver side after i replaced the seat belt
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