2000 Honda Passport Check Engine Light On: P0171, P0172, P0174, P0175 & P0463 Fuel Level Sensor Code Explained
Hi everyone — I recently noticed that the check engine light on my 2000 Honda Passport is staying on consistently. This started happening after a few weeks of driving with low fuel levels, where the light would come on but reset when I refilled. Now it's persistent. The OBD-II diagnostic tool returned these codes: - P0171: System too Lean (Bank 1) - P0172: System too Rich (Bank 1) - P-0174: System too Lean (Bank 2) - P0175: System too Rich (Bank 2) - P0463: Fuel Level Sensor Circuit High Input I'm not very experienced with car mechanics, and I'm confused — how can the system be both too lean and too rich in different banks at the same time? Additionally, I only recently bought this vehicle (about two months ago), and I was surprised to find that it takes nearly 15 gallons to refill. The owner's manual states a 23-gallon tank capacity — so I'm wondering if the P0463 code might be related to this discrepancy in fuel volume readings? Any insights or suggestions on what could be causing these codes and whether they're linked to the fuel system or sensor issues? Thanks for any help! Vehicle: 2000 Honda Passport, V6 4x4, 95,000 miles
Check the fuel pressure and fuel volume. A faulty fuel pump or pressure regulator could be causing inconsistent readings — especially since the fuel level sensor is often integrated with the fuel pump. If the sensor reports incorrect levels, it may trigger P0463 and contribute to misfires or lean/rich conditions in both banks. Consider having a professional inspect the fuel system and sensor calibration. Good luck — please update if you find any fixes!