I`m after a quick answer, how do i know which air sensor i have.. I have been told that i should have an OFAB air sensor on my 2.1 zvh..

how can i tell??

 

i 'think' the ofab is a square 2 pin connection and is screwed into an adapter but the ofac is just a big round plug one,others will confirm tho!!

 

OFAB and OFAC air temperature sensors are both the same. They look like a black rod and have a two pin plug on them. It's the normally aspirated ones that have the round plug.
Unless you are talking about MAP sensors that measure air pressure... In which case they are different.