I recently just started getting this code (P0337). The strange part is I have been running a test pipe for months and had no problems. Then I installed an uicp and intake and after a week of driving this code popped up. I'm running a basically stock tune just tephra mod for the knock sensor warning light, and I also scaled the maf. When I installed the test pipe, I couldn't get the 02 sensor out of the stock cat so I just left it out and disabled codes P0139 and P0140 in the ecu. I also set ECU Options Set #2 bit.1 = 1 (aka Disable Rear O2 Sensor).


Now I'm getting this P0037...is there a way to disable it?

 

I think that's the 02 sensor heater code and from what I read there's no way to disable that yet. I'd keep trying to get that sensor out. If you don't have an 02 sensor socket you might want to give that a try.