My daughter has a 99 Accord LX, with a Vtech 4 cyl. When I go look up parts for it online, they always have two versions of the 4 cyl. listed. The only difference is where it says VIN: F23A1, or VIN: F23A4. Neither of those numbers is in her VIN number. Help me crack the code here.

Edited to add: I know these are the same motors, either with/without the low emission crap, but how do I know which one she has?

 

The first letter is the engine series (F, H, J). The next two numbers are the displacement and the final two are the engine revision. F and H are four cylinder and J is six cylinder.

Pop your hood and look for a white sticker with black computer generated letters. That sticker should have the entire series of numbers you are looking for. On my 98 V6 it's on the passengers side by the alternator and shows the J30A1 code.

 

Yep. To the side of the VTEC block.

 

Also, the parts for the F23A1 and the F23A4 are going to be identical 99% of the time.