Halp! My car alarm is going off randomly. Based on my research, there are a myriad of things that could be causing it. I know nothing about cars and really feel in over my head. My car was running great until last month when...
-alternator belt broke, causing water pump to break and engine to overheat.
-Took the car to the (non-mazda) mechanic, they replaced the alternator belt, and put in a new (used) engine and water pump.
-Picked up the car this week, but overnight the car alarm started going off randomly.
-Took it back to the mechanic, who put the car on the 'sensor', and they say nothing is wrong.
How do I proceed? Thanks