Honda - OEM - 02 Oxgen Sensor for K20a DC5 EP3

This is the primary wideband o2 sensor you want/need for any K-Swap.  This sensor is also a direct fit for any 02-04 DC5 and EP3s.  It will not work on the 05-06 DC5 TypeS

If you do not have the 02-04 DC5 TypeS primary o2 sensor (and do not have K-Pro to disable a missing senor), the engine will not run properly and you will throw CEL's. 

If using Hondata's K-Pro, you do have the option to disable the primary o2; however, we're not sure who would want to do such a thing.  When utilizing K-Pro and this sensor you have the ability to check your A/F ratios and dyno or street tune the car to perfection. 

It's a great check for any tune you may upload, and a powerful tuning tool.
If your K-Series Swap never came with this sensor, this is a Karcepts MUST HAVE item.