2003 Cadillac CTS 3.2 V6 Flashing check engine light P0171 P0174 Lean Bank 1 Bank 2 Checking for air leaks vacuum smoke test boot connection clamp

12 Dec 2003 Cadillac CTS 3.2 V6 Flashing check engine light P0171 P0174 Lean Bank 1 Bank 2 Checking for air leaks vacuum smoke test boot connection clamp