I have a 2005 XC90 which keeps displaying the message 'Rear Park Assist needs servicing' This is despite us have one of the sensors replaced some time ago. They can't find out why this keeps happening at the service centre. Has anyone else had this problem and been able to find a solution?

SOURCE: Park Assist Sensor Busted

Take it back to the dealer. There is a Technical Service Bulletin on the wiring for the Park Assist.

SOURCE: 2005 XC90 automatic - Will not shift from Park.

There is an electronic relay that controls the shifting--that is why yuou have to push on brake to shift from park. THe relay is gone bad.

SOURCE: 2005 Lincoln Navigator. Message says to Check

Most likely the problem you are experiencing with the park assist is a fault in one of the sensors mounted in the rear bumper. I would not consider it to be a major fix, however there will be a few hours labor involved as the bumper cover needs to be removed to replace the sensors.

Raygin

• 322 Answers
• Posted on Jan 20, 2010

SOURCE: Bad parking assist sensor.....is there a fuse for the park assist?

This is a shared fuse, if you remove it you will lose other services. As your reverse aid sounds all the time it has a probable fault in the module or wiring. The module is located in the left hand side lower boot. To disable - pull the plugs from the module until you get it checked out. These modules often suffer from dampness in the boot as it is prone to leaking. sometimes just removing and refitting the plugs and then spraying with a water dissipating spray (WD 40) often brings them back to life once they have dried out.
hope this helps - good luck.

SOURCE: I have a 2006 Ford Explorer and 2 of my park aid

You only need to remove the bumper cover. Remove both tail lamp assemblies. Under the tail lamps you will a 10mm and a 8mm bolt, remove these. Look into each rear wheel well rearward and you will find a T20 torx screw on both sides, remove these. On the top of the rear bumper, between the bumper and the bottom of the liftgate opening you will find 6 to 8 plastic rivets that can be removed by pulling the center pins out, remove these. At this point you should be able to lift upward and rearward and release the bumper cover. Once the cover is free you must disconnect the electrical connector to the sensor wiring harness. With the bumper cover on the ground or a bench, you will see 4 9/16" nuts that hold the styrofoam bumper cushion to the bumper cover, remove these. Now you should be at the point where the backup sensors are accessable. When you install the new sensors be sure your electrical connectors click when they connect. these connectors go on hard and if they don't click you will be doing this job again. Reassemble in reverse order.
Hope this helps