W221 Front Parking Sensor Replacement

[hamodi]

Hello! My parking sensors have started to stop working intermittently. I am getting the following error when scanning using iCarSoft MB II:

- 9009 B8/3 (Inner left front PTS ultrasonic sensor): Sensor is faulty. Current and stored.

According to some youtube video comments, a lot of people have had success removing moisture and getting them working again by spraying with WD40. Unfortunately this didn't work for me so I intend on replacing.

I tried doing a search but couldn't come across any DIY guide and just wanted to know if anyone has changed front parking sensors on the W221 S class before? Specifically, does the front bumper need to come off or is there any way to get the lower grill unlatched so I can reach the sensor without removing the front bumper?

Many thanks in advance.

 

[Pegbasher]

Not sure specifically about the W221 but I have a W209 CLK and just replaced my inner front left sensor which was damaged.

I didnt remove the whole bumper but removed the bolts and retaining clips on the left side only which gave enough to pull out the bumper to reach the sensor.

HTH

 

[Botus]

is this car late enough it has the 4 round visible sensors ?

earlier high spec ones had radars instead and this is another level of fun - then they all moved in 2007 to the visible ones - round ones should be plug and play - pull the covers from beneath and see if there's access