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Hi All, I am a new owner of a slightly modified 2003tt and love it. I bought it about 2 months ago and just last month the check engine light came on. I went and bought the durametric entusiast cable (which I read about here - thanks to everyone) and read a p1145. I watched the o2 sensors while the car was running and they seem good (voltage fluctuating and both bank 1 and bank 2 seem to have simular readings.) I did notice the sensors after the cat have spacers. (PPI didn't state that and I didn't know a thing about it until reading forums). Anyway a long story short I was reading the maintenance records of the car and noticed one mentioned a small crack in the aftermarket header (oh yeah techart headers and exhaust and I believe k24 turbos and GIAC flashed) - anyway I looked and in the collector of the bank 1 header it looked like a small black line which I assumed might be the crack. Would a crack in the header cause a P1145? Any other good checks? Car seems to run fine but rich at startup. Lots of power. Any help would be great! Thanks all!