Join Date: Jul 2005
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A diagnostic check should pick up the fault.
Just after we got our Lagu II we noticed the u/sonic sensors weren't working on the alarm - went to dealer who confirmed & fixed fault in one trip ( full marks) and also said that during the check it picked up one of the u/sonic sensors as not working - they replaced the offending sensor and all was well - all under warranty.
Whilst yours is out of warranty it may be worth trying to get a diagnostic check done to find out where the problem lies.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.