* The oxygen sensor monitors the amount of oxygen in the exhaust gas to ensure proper fuel-air mixture and efficient combustion.
* A faulty oxygen sensor can cause the check engine light to illuminate.
2. Spark Plugs:
* Spark plugs are responsible for igniting the fuel-air mixture in the engine.
* Worn-out or malfunctioning spark plugs can lead to misfires, which can trigger the check engine light.
3. Catalytic Converter:
* The catalytic converter reduces harmful pollutants in the exhaust gas.
* When the catalytic converter becomes inefficient due to age or damage, it can cause the check engine light to turn on.
4. Evaporative Emission Control System (EVAP):
* The EVAP system prevents fuel vapors from escaping into the atmosphere.
* Leaks or other issues in the system can cause the check engine light to come on.
5. Mass Air Flow (MAF) Sensor:
* The MAF sensor measures the amount of air entering the engine.
* A faulty MAF sensor can affect fuel delivery, leading to issues such as rough idling or poor fuel efficiency, and can trigger the check engine light.
6. Faulty Fuel System Components:
* Issues in the fuel system, such as a malfunctioning fuel pump or clogged fuel filter, can affect engine performance and cause the check engine light to illuminate.
7. Transmission Problems:
* Transmission-related concerns like slippage, harsh shifts, or malfunctioning sensors can sometimes trigger the check engine light.
8. Engine Control Module (ECM) Issues:
* The ECM is the "brain" of the engine and controls various functions.
* Malfunctions in the ECM can lead to various engine problems and the check engine light coming on.
9. Emission Control System:
* Infiniti Q45 models are equipped with various emission control systems.
* If any component of these systems malfunctions, such as sensors or control valves, the check engine light could be illuminated.
10. Loose Gas Cap:
* Though not directly related to engine performance, a loose or missing gas cap can trigger the check engine light in certain vehicles, including Infiniti Q45 models.
It's important to note that the check engine light can be triggered by various issues, some of which may not pose immediate risks, while others require prompt attention to avoid further damage or safety hazards. If the check engine light comes on, it's recommended to have your vehicle diagnosed by a qualified mechanic to determine the exact cause and appropriate solution.
