i recently put 99 Si swap in my buddies 99 Ex...we used the stock Ex harness and repined distributor...here are the codes it is throwing...

17-speed sensor(hence no Vtec)
20-electrical load sensor
41-primary o2 heater sensor
65-secondary o2 heater sensor

i think i know the problem with the code 17....but..wtf are the other codes..have no idea where to check for these problems....help?

thanks guys!

-Mike

 

Code 20 I have no idea, but the heat sensor's are the o2 sensors. Check the wiring to make sure it matches the o2 sensors.

 

Try checking the Alternator SP Fuse 15 (7.5A) in the under-dash box. They all have this in common.