Question about 2007 Ford Focus (3 Door) Hatchback

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My rear parking sensors have an intermittent problem they sometimes work other times they emit a series of short beeps no matter how far away an object is

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  • Ford Master
  • 22,095 Answers

Fancy electronics and their faulty ,its these chineese chips they use nowdays,best advice is to disconnect and reverse like i was taught ,look over your shoulder

Posted on Apr 09, 2011

Testimonial: "couldnt agree more...thanx"

  • petetheflute Apr 09, 2011

    let me know how i can disconnect

  • Colin Stickland
    Colin Stickland Apr 10, 2011

    not sure how to disconnect as i havent had to do one as yet where the unit was factory fitted only disconnected these things where they are a add on by a previous owner ..

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Posted on Jan 02, 2017

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Porsche cayenne 04 rear sensors indicators show red and dont go green, front ok


So I understand this to mean the proximity sensors designed to detect obstructions when backing are not working? Do these tie into the computer so that they could result in malfunction codes?
This video is obviously not Porsche but it may be helpful for diagnosis.

I also found this:
Check the parking sensors control unit to see if it is wet or damp from water in that location. It is located in the rear storage area of your Cayenne. Open the rear door then pull open the cover on the left side and sitting on the bottom just aft of the left wheel well it is a little black box that controls your parking sensorsystem. If it gets wet you will have issues or failure of your parking sensor system. If it gets or was wet or damp back there you will have to dry the unit off, if it has shorted/burnout the control unit will need to be replaced. For a short term fix dry the control unit off and place it in a plastic bag to prevent it from any water in the future. Then you will have time to look and see why water is getting in that area.... This has been a common problem....

Someone else reported that they reached up behind the bumper and found the rear of the sensors coverd with mud and clearing them off fixed the problem.

Rennlist is a good resource:

Parking sensors not working intermittent Rennlist Discussion Forums

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