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Thanks for the feedback, but i guess i got a bad ecu. Just wanted to see if anyone had ever ran into code 1 and it not being 02 sensor.

4 wire :confused:

Well it's an aftermarket 02 sensor, but what do you think about the other ecu working fine and this ecu throwing the code 1?

Just did a d16z6 swap into a civic vx and i'm running a stock p28. I got a code 1 after i drove for about 5 minutes, I cleared up the code and tried it again. The 02 sensor is brand new, so i know it's not that. My friend let me borrow his p28 and i drove it for a good half hour and no CEL came...