Where is the anti theft relay located on a 2001 Chevy Monte Carlo?

There's no single "anti-theft relay" in the traditional sense on a 2001 Chevy Monte Carlo (or most modern vehicles). The anti-theft system is integrated into the car's computer system (PCM - Powertrain Control Module) and uses various components, not just one relay, to disable the vehicle's starting system. There's no single point to disable it.

The theft deterrent system is sophisticated and often involves the following:

* Passlock System: This is the most likely component causing starting issues related to theft prevention. It's integrated into the PCM and uses a chip in the ignition key to authorize starting. A problem with the Passlock system would require a diagnostic scan to identify.

* Various sensors and modules: The system might use inputs from other components to determine if the vehicle is being tampered with, but these aren't isolated "anti-theft relays."

If you're having starting problems, it's highly unlikely a simple relay replacement will solve it. You need professional diagnostics to identify the cause. A mechanic with a scan tool can check for diagnostic trouble codes (DTCs) that will pinpoint the problem with the Passlock system or other components within the anti-theft system. Attempting to bypass the system without proper knowledge can damage your car's electronics.