Oxygen Sensor Question..

[SilviaSR20DET]

Im about to replace a new 02 sensor. Does it usually have the clip to install it easier or do you have to splice wires? How often do you need to replace 02 sensors i currently have about 41700 miles on my car and the 02 looks pretty old and worn do you think i should replace it or is there a way to test it like with a multimeter? What voltage should it read if its good or bad? I know pdm racing carrys them are they the ones that are clip ons? Any help will be appreciated, thanks.

[Phoen_x_s14]

dam, dunno bout the SR20's but 95+ 240's with Ka24, O2 sensors come in either universal or oem type with the connector. Best to get from dealership and with the connector, I bought the Boush universal one from autozone it spliced everything right, somehow I kept failing emissions, $80 down the drain. You should replace the O2 sensor about every year and a half. I would e-mail PDM or any other shop that knows about SR20's.

[the head]

o2 is not that expensive i bought a direct fit Bosch O2 with proper plug for like 40 at a local parts store for my SR just need to shop around before you pay an assload for parts