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my check engine light comes on my 04 XLR dealer codes are P0101, P0171, P0174 on 2004 Cadillac XLR

I have a aftermarket top and bottom mesh grille and aftermarket exhaust system only from the catback. Caddy dealer fills the problem is due to the mesh grill not getting enough airflow i don't beleave that's the problem and i don't have the OEM grille or nor the OEM exhaust to prove them wrong the car is still covered under warr. I fill it due to vacuum leak. thanks Derrick

Asked by for the 2004 Cadillac XLR
po101 is mass a/f issues and po171 and 174 are lean bank 1 and 2 which could be the mass a/f issue.what kind of a/f is in car and is it clean? can you remove grill and just leave it out to create more air flow? that would prove them wrong. you exh has little effect on these codes
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