A:Answer Typically there is a lot of confusion with any estimates, every car can be different with different anti theft systems just supplying your year make model wouldn't gaurantee an accurate estimate... Here's a few examples
2003 Toyota Corolla s model came with or without a Antitheft key as a factory option would not know until the car is disassembled.
2001 and up Ford F-150 does it have factory keyless? If not additional parts needed and labor
97 and up Dodge Ram factory anti theft option does it have a black key or grey key? Difference in parts are 100's of dollars for just the type of key you may have ....
It goes on and on for nearly every car no idea what your vehicle has equipped post factory assembly, some of these cars supplying a vin would help but moral of the story don't be lazy call or stop in and speak with the installer directly ...Hope this helps