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Old 21st May 2009, 23:28   #1
Mr.Devere
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Parking Sensor Fault??

Hi Guys, after some help. I knew I had an issue with the PDC as when I put the car in reverse it gives the continuous beep. Checked all the rear sensors and the passenger side is clicking, luckily the one in the trim. Disconnected the sensor and I still get the tone, guessing it detects no sensor as well as faulty sensor. Bought a new sensor, checked compatibility on RealOEM, when it arrived it is not the same as the one on the car. The sensor conector is identical so I thought I'd plug it it to see if the issue corrected. When it was plugged in still get the tone and the new sensor is clicking so I'm stumped. Anyone ever heard of this? Could it be the cable or PDC unit itself, anyone any ideas on how I would check this?

Car is 99M5, rear PDC only, BJ10364

Any help is appreciated.

Mike
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Old 22nd May 2009, 12:36   #2
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If is clicking then it's working, try swapping the new sensor with the other sensors.
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Old 22nd May 2009, 12:39   #3
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Oh dear, there was only 1 sensor clicking the other 3 were quiet..........thanks for the input, of course it was never going to be that easy..........
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Old 22nd May 2009, 14:28   #4
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I concur, sounds like you have 3 bad sensors, not 1. Swap the new sensor in place of the other 3 to determine if the sensors are broken or if you have a wiring issue.

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Old 22nd May 2009, 16:32   #5
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my two rear outer ones dont work. Is this an easy fix? DYI instructions?
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Old 22nd May 2009, 18:09   #6
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Sensor compatibility

Cheers Doug, I'll try that to see where the fault is. To have 3 sensors gone is unlucky. My inital joy at having 1 easy repair sensor faulty was a tad hasty as it's looking more like 3 are going to need replacing so its bumper off.

Adam, the trim mounted sensors are an easy repair. To remove the plastic trim look underneath the trim itself on the edge nearest the rear door, you will see a cut out. Get a flat tip driver and prize off the trim. Suggest you mask the paint underneath the trim, I built up a couple of layers of masking tape to help protect the bumper if I slipped. My trim was quite tricky to remove, I guess it has not been off in 10years so fair enough, you just need to be quite forceful without bending it at too sharp an angle, it will come off, just takes a bit of effort, or mine did anyway.

I ordered a replacement sensor from e-bay (66 21 6 938 739), confirmed on RealOEM that it was a compatible part and when it arrived turns out it is not the same. See pics when I removed the sensor the part number on it is (66 21 6 902182).

I was wondering if these sensors are cross compatible, i.e will the complete round one work in my vehicle, I have also read the original ones require painting. If this is the case I might just order another couple of the full round sensor (938 739) as my car is black they will look OK.
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Old 22nd May 2009, 18:20   #7
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I had my two inside one's go and i managed to do mine without removing the rear bumper, its a bit tricky but it can be done.

I also had trouble getting replacements without paying the ridiculous dealer prices, according to the information i had the sensors are not necessarily the same to a particular year of manufacture. My one's are square but the ones i purchased are exactly the same, just made round the other way, so they now detect the ground lol.
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Old 22nd May 2009, 19:14   #8
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Seriously you managed to do it without removing the bumper, I have read quite a few post saying the bumper needs to come off, I'll have go without the surgery first.........any tips??

I just made a guy an offer on e-bay, he's got an auction for 4 of the oblong/square type sensors that are on my car, I'm sure the round ones will work, but I don't want to get 3 new sensors and a dented bumper to find out that there are some compatibility issues............mm ground detection is that a whole new retrofit? I could phone the main dealer and ask if they stock them.............
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