How do you fix code P0171 for 2004 Isuzu Rodeo?

Code P0171 indicates a lean fuel condition in your 2004 Isuzu Rodeo. To fix this, start by checking for vacuum leaks in hoses and the intake manifold, as these can allow excess air to enter the engine. Next, inspect the MAF (Mass Air Flow) sensor for cleanliness and proper function, and consider replacing the fuel filter or checking the fuel pressure to ensure adequate fuel supply. If these steps do not resolve the issue, further diagnostics may be needed to check the fuel injectors and the oxygen sensors.