I'm installing an apexi turbo timer and i've run into this problem. The directions for making the ecu connections appear to be wrong. It shows that i should have 4 connectors on my ecu but i have 5. i can't seem to figure out where the 02 sensor is and the ground is. Can anyone help?
P.S I have an 02 wrx with an automatic transmission.
Here is a picture.
I've already done a search and i can't seem to figure it out.