Hey i have a 97 accord auto 2.2 SE and i wanna know where can i buy the Mainshaft Speed Sensor?

 

Go through a Honda dealer. An internet Honda dealer such as Bernardi Honda parts, Majestic Honda, etc. will give you the best price and OEM part.

Places like RockAuto.com has the Mainshaft Speed Sensor as aftermarket; but, the cost is actually higher than an internet Honda dealer such as Bernardi.

Here's an example of one internet Honda dealer.

hondapartsnow.com/transmission_automatic/atm03~1997~honda~accord~4dr_se~4at~ka~right~side~c over.html

I have not dealt with the example I posted; but, have dealt with Bernardi Honda parts and I like Bernardi.