P1441 and P0171 Diagnostic for 1997 Pontiac Grand Prix After Engine Replacement
After installing a new engine in my 1997 Pontiac Grand Prix, the onboard diagnostic system is showing both fault codes P1441 and P0171. What should be the first component to inspect or replace? Is the oxygen (O2) sensor the most likely culprit?
Before replacing any sensors, check for vacuum leaks. Even though a new engine has been installed, vacuum leaks can still cause these codes to appear and are a common issue in older vehicles like the 1997 Pontiac Grand Prix.