good question.....we has been experience before.it will be depend to the installer how there do it. but the correct way is arm the alarm then the engine still running after just switch off by the timer.
Anybody know where I can buy the stock original sensor? want to replace my old 0/2 sensor lor....It's 15 year already...maybe time to replace....how much are..where can fine cheap2 and what are the code number for...