* A faulty oxygen sensor: The oxygen sensor measures the amount of oxygen in the exhaust gas and sends this information to the engine computer. If the oxygen sensor is faulty, it can send incorrect information to the computer, which can cause the engine to run lean.
* A clogged fuel injector: A clogged fuel injector can prevent the engine from getting enough fuel, which can cause it to run lean.
* A faulty fuel pressure regulator: The fuel pressure regulator controls the amount of fuel pressure in the engine. If the fuel pressure regulator is faulty, it can cause the fuel pressure to be too low, which can cause the engine to run lean.
* A faulty mass air flow sensor: The mass air flow sensor measures the amount of air that is flowing into the engine. If the mass air flow sensor is faulty, it can send incorrect information to the engine computer, which can cause the engine to run lean.
