If the key looks basic — thin shaft, simple grooves, no chip housing — it likely belongs to an older vehicle. Modern cars typically use electronic key fobs, transponder chips, or push-to-start systems.
So already, you can eliminate a few contenders.
If two of the five cars are newer models with keyless ignition systems, the plain mechanical key probably doesn’t belong to them.
But that’s just step one.
Understanding How Car Keys Work
To solve this puzzle properly, you need to understand what makes a key unique.
A traditional car key works through:
Cuts (or bitting) along the blade.
Groove patterns along the sides.
Length and thickness of the shaft.
see next page
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