God knows why Toyota didn't put a gas cap on the 2nd generation Tacoma. This stant lock gas cap fits my 2006 Toyota Tacoma perfectly and had no problems no check engine light etc. To make sure it was tamper proof I tried to gently unlock the locking mechanism with a paper clip and then a small screwdriver. . None of them worked. I've also tried pressing firmly on the cap and unscrewing it (some say it will work) but it hasn't come loose. Apparently it only unlocks with one key, so I'm happy. The construction feels a little flimsy, but what can you expect from a $13 plastic gas cap. UPDATE 6/16/2016: The gas cap accidentally fell from a height of 4 feet onto a concrete surface. The internal mechanism has become detached from the case and the lid no longer works. Again, what can you expect from an inexpensive gas cap. Just don't drop it and it will work just fine. The lid gave me no problems for 6 years prior to this accident.
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