Lost Your Key Fob or Need a Spare? We Program It at Your Car.

Your key contains a small chip that broadcasts a unique code when it enters the ignition. The vehicle's immobilizer control module compares that code to its authorized list. If it matches, the engine starts. Programming teaches the module to recognize a new chip's code. We connect diagnostic equipment to the OBD-II port, access the immobilizer system using manufacturer-specific software, and add the new key's code to the authorized list. On most 2010 and later vehicles this takes 20 to 45 minutes on site.

All-keys-lost programming applies when every key to the vehicle is gone. Normally, adding a spare key uses an existing working key to authorize the new one. Without any existing key, we cannot use that shortcut. Instead we access the vehicle's EEPROM, which is the memory chip that stores the authorized key list, read its current data, erase the old key codes, and write new ones. On some makes we do this through the OBD-II port. On others, including many European models, we must physically read the EEPROM chip from the BCM or ECU. The process takes 60 to 120 minutes and requires specialized hardware not carried by most mobile locksmiths. We do. Cost typically runs $200 to $500 depending on make and model.

Rarely. Replacing the coin cell battery in a key fob does not erase programming on most vehicles built after 2005. The transponder chip is passive: it draws power from the ignition coil's radio frequency field, not the fob battery. The fob battery powers only the remote lock and unlock buttons. If your vehicle does not start after a fob battery swap, check that the battery is seated correctly and the contacts are clean. If it still will not start, call us. A small number of European models, particularly older BMW and Mercedes, can lose transponder pairing after a complete battery drain. We diagnose it on site.

Often, yes, if the blank is the correct OEM or compatible aftermarket chip type for your vehicle. Bring the cut-but-unprogrammed key and we program it at your location. We verify chip compatibility before starting: the wrong chip type cannot be forced to pair, and some cheap aftermarket blanks use counterfeit chips that fail midway through programming. If you are unsure, let us supply the blank. We stock OEM-compatible transponder blanks for Ford, GM, Toyota, Honda, Nissan, Hyundai, and most domestic makes.

No. Adding a new key to the authorized list does not remove existing keys. Your other programmed keys continue to work normally. The only exception is all-keys-lost programming, where we must clear the old key codes before writing new ones. Since those keys are gone, clearing them causes no practical problem.

Typically 30 to 50 percent less, sometimes more for smart keys and luxury vehicles. A dealer transponder key for a 2018 Honda Civic runs $200 to $300 including programming. We program the same key for $75 to $150 depending on whether you supply the blank. Dealer smart key programming for a 2022 Ford F-150 with Intelligent Access runs $350 to $500 at the dealership. Our mobile rate is $150 to $250, and we come to your driveway or parking lot. You also skip the tow if you have no working key.

Yes for most models. European vehicles use more complex immobilizer architectures than domestic makes. BMW CAS and FEM modules, Mercedes EIS, Volkswagen and Audi KESSY systems all require manufacturer-level diagnostic tools, not generic OBD scanners. We carry Autel MaxiIM, XTOOL, and Yanhua ACDP equipment that covers the major European platforms. Call with your VIN and we confirm coverage before dispatch. A small number of late-model models with dealer-only key registration may require a dealer step; we will tell you if that applies before any work begins.

Yes. We dispatch mobile automotive locksmith service to Round Rock, Cedar Park, Pflugerville, Georgetown, Leander, Kyle, Buda, San Marcos, and 36 Texas markets. Mobile service is included in the programming price. No towing required. Call us with your vehicle location and we route the nearest technician.