would an OBD1 h22 require a 4 wire 02 sensor. im am swaping one out in an ED. because i was thinking just buying a obd0 to obd1 conversion harness with a 4 wire o2 in it as well as a vtec subharness to hook everything up.. but im not sure if they have a 4 wire o2. or if they have 2 o2s and not just one

 

the O2 sensor has to match the ECU not the engine.

so which ECU are you planning on running?

 

p13

 

well, i have heard that people run p28's on the h22. wich in fact does require a 4 wire 02 sensor. quick question tho. is the p28 gonna run the car leaner since it was designed for a smallr motor that was not really a performance one relatively speaking. not trying to steal the thread tho.

 

P28s can be used to run a H22 if they are chipped to run the H22. (converted P05/P06/P30 or a standard P72 will do it as well)

I know very little about the P13, but based on the bins I've seen, it looks like it uses a four wire O2.

**edit**
also... https://honda-tech.com/zerothread?id=650329
states you have to add the wires required for the one O2 sensor.