[strommj]

There's a chance that my oxygen sensor could be bad. If I confirm replacement needed, do I replace it with an ep3 sensor or a rsx type s sensor? Or are they the same and it doesn't matter?

Also additional question: do the years match up the same? For example is a 2005 civic si equivalent to the 2005 rsx, or is it a 2004, etc.

My ep3 has a k20A2 from the rsx type s and a rsx ecu

 

[yaggs]

My ep3 has a k20A2 from the rsx type s and a rsx ecu

I would go with a sensor from 02-04 rsx type s. Those years are specific for that engine. Recommend denso brand, as it is the oe manufacturer.