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After weeks of research, i still can't solve my issue. Background on the car;

2004 Civic SI-G, K20A3 swap, 5-speed tranny, 650cc injectors, apexi catless exhaust, greddy turbo kit, K-pro. That covers the basics.

Now originally the CEL will come on, and show P1166. I've been told that since i don't have a cat, you can disable P1167 in K-pro to solve this issue. So the shop does this, and now the car pulls up error code P0134. My first concern is that prior to any CEL's coming up, there were no error codes disabled on my tune. I've talked with Hondata, i've talked with multiple performance shops and my car is currently sitting at a shop and they can't figure it out.

So if anyone can shed some light on this issue, it would fan-****ing-tastic.

Thanks,

 
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Also forgot to add, the primary sensor has been changed. After changing the sensor, the shop found some wires that had melted on the downpipe. They believe one was a constant power wire to the sensor, but that still hasn't fixed the problem.