ok i have a 94 gsr with a b20 in it. i have the megan itr replica header with the o2 bung in the collector and an smsp cat. now my question is... i was looking on acuraparts247.com and noticed that the primary o2 sensor on the gsr and the ls are different. both part numbers are the pame except the gsr says p72 in the number and the ls says p75. with the different motor is it going to matter what sensor i get or which one would you recommend that i get. by the way i am getting the oem ntk sensor. i just need to know which model car to buy it for. thanks

 

i dont think there is a difference in them. people say different **** but essetially the sensor only reads the exhaust fumes. if you want to be 100% just get the b20

 

I would get the o2 that more matches to the ecu,
but if you have an obd1 chassis/harness, then get it for that.

 

what ecu are you running?

 

i am running the obd1 pr3 ecu not to be mistaken for the obd0 one. as for the harness everything is obd1. but both the ls and the gsr part numbers were obd1 and were both the same number one just said p75 and one said p72. as far as the ecu goes i believe its from an integra xsi with a b16 and other than a del sol i can't think of anything else in the states that had a b16obd1 motor. maybe i am forgetting something but anyways still need a positive answer

 

it really makes no difference man... i had an o2 sensor from an accord on my gsr swapped civic... worked like a charm. dont sweat it just get one. makes no difference. If you are concerned then get the one for a B20