Pack-2 Car ECU Induction Signal Detection Coil, 2.67" OD 1.69" ID Key Lock Chip Anti-Theft AUT Diagnostic Tool, Portable Sensitive Monitor Card, Universal for Cars with Sensor Rings (Red)

It seems to do the job but you have to be ready. I used this tool on 3 different vehicles that the antitheft system was working fine on. Each one only gave a very brief blip of the LED light. It was enough to verify the system was working and prove the switch coil was being energized, however. This is still good info you need when troubleshooting an antitheft problem. For such a cheap tool, it can really help out your troubleshooting.I only got one of these instead of 2. Also, the ad copy says this can read fault codes in the ECU but that part makes no sense to me.