What are the the sensors on the back of a obd0 B16. I know one of the three is the oil pressure sensor, But what is the one on top of the water passage (looks like the vtec pressure sensor) and the one that is simular to the oil pressure sensor except bigger and has a two pin connector.

Thanks in advance

 

coolant temp switch or thermo switch assembly.

if you're converting to OBD1, i suggest you get the later model switch which is located at the thermostat housing, #11 P.N. 37760-P00-004 but you have to replace the thermostat housing water neck(attached to the lower rad hose) #5 P.N. 19311-P2T-000.

 

thanks bro... whats the other one

 

knock sensor