My 1997 Nissan Maxima is showing multiple check engine light fault codes: P1105, P030-5, P0174, and P0171. The vehicle has reached approximately 200,000 miles and the Check Engine Light remains on despite previous repairs. These codes have reappeared after maintenance, indicating an ongoing issue. I am seeking help to understand what each code means and how to resolve them effectively.
Can you explain what each of these OBD-II diagnostic codes means in the context of a 1997 Nissan Maxima?
Refer to this forum for detailed explanations of common causes and solutions. - P0171 and P0174 indicate the engine is running lean (excess air, insufficient fuel). Check for vacuum leaks in intake hoses or connections. - P1105 points to a malfunctioning Manifold Absolute Pressure (MAP) sensor, which has a vacuum hose attached—ensure it's properly connected and not leaking. - P0305 indicates a misfire in cylinder #5. This could be due to faulty spark plugs, ignition coils, or fuel delivery issues in that cylinder.
After fixing the previous issues, my Check Engine light is still on. The same set of fault codes—P1105, P0305, P0174, and P0171—are now appearing together. I suspect there may be a recurring problem that needs deeper diagnosis.