I've been tinkering around a little more with this - got a really dumb question and a couple of reasonable ones: - the CEL went away for a few days and then came back on - I got a slightly better multi-meter but this one auto reads between MV and V so it's harder to tell the actual digits, but I think I may be getting a code 25 instead of 23 now....whats a good way to link a video here so i can get someone else's take?

Also, What exactly is the top dead center sensor and where is it located? I can't find this illustrated in the service manual anywhere nor can I find a part name or number for "top dead center sensor" for this vehicle. Is it called something else now? Please help.

Third - I replaced the ignition coil and the water temperature sensor and I noticed that the water temp sensor doesn't screw all the way in - my old one looked super corroded on the top three threads that stick out the top and the new one only screwed in the same amount - seems like this is how it's supposed to be but wondering if there's any kind of sealant I should be adding to the threads to ensure it works correctly and doesn't leak.

Thanks