Jetta Mk5 Park Assist sensors not working - No Signal/Communication

[ak77]

Hi Guys,
My Jetta park sensors (front/back) don't work. Rear bumper was originally refitted after small accident (scratch).
Fist time the codes didn't appear. After second scan I only had two sensors at rear show as problematic. Now its all 4.
Continuous beep as car reverses. Have to push "P" button down every reverse time.

Not sure how to tackle this one. This is my first post.

Any assistance would be appreciated.

These are my codes:

Tuesday,13,January,2015,14:39:54:41771
VCDS Version: Release 14.10.0

Address 10: Park/Steer Assist Labels: 3C8-919-475.clb
Control Module Part Number: 1K9 919 475 HW: 1K9 919 475
Component and/or Version: PARKHILFE 8K H07 0001
Software Coding: 100101
Work Shop Code: WSC 00066 000 00000
VCID: 78FFDBC0CB7060E157B-802D
4 Faults Found:

01545 - Sensor for Parking Aid; Rear Left (G203)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 221
Mileage: 92391 km
Time Indication: 0
Date: 2055.14.05
Time: 14:36:57

Freeze Frame:
Temperature: 31.0°C

01548 - Sensor for Parking Aid; Rear Right (G206)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 221
Mileage: 92391 km
Time Indication: 0
Date: 2055.14.05
Time: 14:36:58

Freeze Frame:
Temperature: 31.0°C

01546 - Sensor for Parking Aid; Rear Mid-Left (G204)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 221
Mileage: 92391 km
Time Indication: 0
Date: 2055.14.05
Time: 14:36:58

Freeze Frame:
Temperature: 31.0°C

01547 - Sensor for Parking Aid; Rear Mid-Right (G205)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 221
Mileage: 92391 km
Time Indication: 0
Date: 2055.14.05
Time: 14:36:58

Freeze Frame:
Temperature: 31.0°C

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[vdubmotorworx]

remove the rear bumper and check the main plug for the sensors that links into the car...ive seen body shops leave this off or loose