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I have a 97 Celica, and finding the correct size nut was a VERY frustrating ordeal. I finally had to go to a Toyota dealership to purchase them (Home Depot, Lowe's, Ace Hardware, even tried KMart, all didn't have the correct size). Didn't matter if I purchased metric nuts or not, Toyota seemed to had made the nuts for there O2 sensors special.

Anyways, the dealership ended up special ordering the for me ($2 a pop). I think they referred to them as self-locking nuts. Anyways, even I installed them, it was a very tight fit...but eventually got them on.

Hope any of this helps. The thread size is metric M8x1. It is not available in most stores. You can buy a machine tap and make your own. An equivalent American size is 5/16-20 UN. It's a very rare size, so don't even bother looking. If you decide to make your own nuts, I suggest you use 300 series stainless steel.

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โˆ™ 2008-03-09 15:30:51
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Q: What is the thread size to the O2 sensor flange nuts of a 1998 Toyota Tacoma?
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