Automotive Locksmith Key Cutting & Programming Flashcards

What does the 'keyway' of an automotive lock refer to?

Answer: The channel cut into the key blade that accepts the lock's warding

The keyway is the specific profile shape of the key slot, including warding (projections inside the cylinder), which prevents incorrect keys from entering.

When using an automotive OBDII key programmer, which of the following data is typically required for a 'add key' procedure on a modern vehicle?

Answer: A working key, the VIN, and often a dealer-level PIN or security code

Most modern add-key procedures require at least one working key for authentication, plus the VIN and a security PIN to authorize new key enrollment.

A locksmith decodes a worn ignition cylinder and finds two positions reading ambiguously between depth 3 and depth 4. What is the best next step?

Answer: Use a progressioning chart to try all combinations for those two positions

When two positions are ambiguous, using a progressioning approach systematically tests both depth options at those positions until the correct combination is found.

What is a 'flip key' (also called a fold-down or switchblade key) and what unique programming consideration does it present?

Answer: A key with a blade that folds into the fob housing; both the mechanical blade AND the fob's remote functions may need to be programmed

Flip keys integrate a foldable mechanical blade with a remote fob; the blade must be cut to mechanical specs AND the integrated fob and/or transponder chip must be programmed.

Which type of automotive key uses a 128-bit rolling code or Texas Instruments DST80 encryption, making simple cloning impossible without specialized equipment?

Answer: Crypto-transponder keys (e.g., Megamos 48 or DST80)

Crypto-transponders like Megamos 48 and DST80 use encrypted challenge-response authentication, preventing direct chip cloning without advanced emulation or EEPROM-level access.

A locksmith needs to originate a key for a 1998 Toyota Camry using a key code obtained from the VIN. The code 'X248' appears in a Toyota code series guide. What does the 'X' prefix typically signify?

Answer: The code is a secondary (indirect) code that must be converted using a conversion chart to obtain the bitting

In many manufacturer code systems, letter prefixes indicate indirect codes that must be decoded through a conversion chart to determine the actual bitting depths.

After programming a new key for a 2015 Honda CR-V, the OBDII tool confirms successful programming, but the engine still cranks without starting. The most likely next diagnostic step is:

Answer: Verify the transponder chip type in the key blank matches the vehicle's required chip series

Even when programming appears successful, using an incompatible chip type (e.g., a clone chip not compatible with Honda's immobilizer) can cause a no-start condition.