Ernesto (Chuck’s assistant) hears Jimmy’s confession, will he blab to Jimmy ?
Determined to discover how someone knew his location and prevented him from killing Hector, Mike dismantles his car without success, then finds a tracking device in his gas cap.
He obtains a similar one, replaces the tracker from his car with the new one, drains the battery of the one he took from his car, and stays up overnight. Someone replaces Mike’s gas cap, thinking he’s picked up the tracker with the dead battery. He’s actually carrying the tracker Mike installed, which enables Mike to find out where the person who switches tracking devices takes the ones he removes.
The tracker is a prop, the closest actual GPS Tracker appears to be :