PROBLEM "SERVICE ENGINE SOON" popped on

[cd001111]

Hi all I have an 04 350z with the APS single turbo, APS dual exhaust, APS down pipes and the Tall Boy. After driving 1000 trouble free miles I installed the APS SG package. The car isn't used that much I now have 5200 miles on the car at this point. From out of no place the "Service engine soon" light popped on. I checked the stock ECU and it pointed me to the Air/fuel meter, I reset the computer but it came back on within a few miles of driving. I took the car to Nissan where it was checked out and determined not to be the Stock A/F meter. The DCT results for A/F sensor (B1) "P1273" with B2 putting out a code of "P1283". Any input you guys could provide would be very helpfull, I wish APS would responded to e-mail.

ThanksCD

[murpheyANDthis350z]

Do you push your car?

[cd001111]

At time I will run up to the red line although I don't beat on the car, I've never dropped the clutch from a dead stop. I have a real time A/F meter and my readings are right on. 14.7 at idle no missing, detination. The car will run OK for a few miles and throw a code out. It just started.