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L322 Front parking sensors


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My L322 front parking sensors don't work. According to the manual if a fault is detected by the PDC ECU in one sensor then all 4 are disabled. Thus I cannot listen at each one to ascertain which is one faulty. The manual also says that if a fault is detected the PDC led will flash and sound a 3 second warning tone, however, mine is not doing this ! The front internal sounder is OK. Is there a way I work out which one is at fault without paying the garage to use their diagnostic kit ? Thanks.

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