Alarm Keeps going off!!! Bonnet sensor changed, no difference

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  1. Alarm Keeps going off!!! Bonnet sensor changed, no difference 
    #1
    Bimmer Fan
    Car Details
    Simsim's Car Details
    Model of Car:
    330d
    Year of Manufacture:
    2007
    Transmission Type:
    Auto
    Car Body Type:
    Saloon

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    Please help. Need to alarm my car.

    I had my car remapped and returned working fine. After a couple days the alarm started going off after locking. I tried locking it again to disengage motion sensor and it made no difference.

    Went back later in the evening. Opened and closed all doors, bonnet, boot and it worked fine.

    Drove off next day. Locked the car and it started going off (without the indicators going off) just the loud chirp from near back left wheel.

    I then tried to tape down the sensor. No effect. I then disconnected the sensor completely. No effect. I changed the bonnet sensor swith. No effect. Mechanic wants £100 to diagnose?
    What could it be???

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    #2
    BMW Maestro
    Car Details
    steviec_lj's Car Details
    Model of Car:
    320i
    Year of Manufacture:
    1987
    Transmission Type:
    Manual
    Car Body Type:
    Coupé
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    Dec 2008
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    Scunthorpe
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    I can safely say it's probably not the bonnet sensor, or wasn't that obvious?

    Have you only used the drivers door? I take it you're the sole occupant when driving it and these problems have appeared?

    That would point to something in that region surely, or do you want to replace the bonnet too? Just to be sure that you've covered the fact that it could be something bonnet related?
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