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[Phil]

Using not so cheapotech2 ("My Naff Code Reader") in alarm section get the following fault code:-

121 no DTC present

What does it all mean??

The alarm does keep going off, not bonnet switch, or internal sensors, if park the car up for couple hours then put alarm on it generally doesn't go off, if i arm alarm straight after a drive (long or short) it goes off after 10-15 mins

Any help or ideas appreciated  

[feeutfo]

Using not so cheapotech2 ("My Naff Code Reader") in alarm section get the following fault code:-

121 no DTC present

What does it all mean??

The alarm does keep going off, not bonnet switch, or internal sensors, if park the car up for couple hours then put alarm on it generally doesn't go off, if i arm alarm straight after a drive (long or short) it goes off after 10-15 mins

Any help or ideas appreciated  

not sure code, but most alarm issues are either bonnet switch(either bend it up, tape it down  or unplug to eliminate) or power sounder under scuttle drivers side( disconnect/replace from breaker)

[VXL V6]

No diagnostic trouble code (DTC)- so no codes stored or present.