ok i guess ill start with saying i have a constant cel. when i had it checked it came up for o2 sensor. now i have a b16a2 is this obd1 or obd2 . and how many o2 sensors should i have, because i only have 1 and if i only need 1 then ill have to get a new one but if not gonna have to try a few things. thanks in advance matt

 

constant cel means the ecu is bad

 

OR bad ground.