1. Oxygen Sensor Issues:
- O2 Sensor Failure: Faulty or damaged oxygen sensors (O2 sensors) in your vehicle's exhaust system can lead to incorrect readings, which can cause these codes to appear.
- Oxygen Sensor Wiring Problems: Issues with the wiring or connectors related to the oxygen sensors can also trigger these codes.
2. Fuel Injector Problems:
- Clogged Injectors: If the fuel injectors are clogged or malfunctioning, it can cause an improper air-to-fuel ratio, resulting in these codes.
- Leaking Injectors: Leaky fuel injectors can also cause an incorrect fuel mixture, triggering these check engine light codes.
3. Mass Air Flow (MAF) Sensor Issues:
- Dirty MAF Sensor: A dirty or contaminated mass air flow sensor can provide incorrect readings, leading to codes 0171 and 0174.
- Faulty MAF Sensor: A defective MAF sensor can also be the culprit behind these codes.
4. Vacuum Leaks:
- Leaks in the engine vacuum system can create an issue with the air-to-fuel ratio, causing the engine to run lean and triggering these codes.
5. Fuel Pressure Problems:
- Low Fuel Pressure: Insufficient fuel pressure can lead to a lean air-to-fuel mixture and cause these check engine light codes.
- Faulty Fuel Pressure Regulator: A malfunctioning fuel pressure regulator can also contribute to issues with fuel pressure, resulting in these codes.
6. Engine Control Module (ECM) Issues:
- Software Glitches: In some cases, software issues or glitches in the Engine Control Module can lead to these codes being displayed.
It's important to note that diagnosing the exact cause of these codes may require specialized diagnostic equipment and expertise. It is recommended to have the vehicle inspected by a qualified mechanic or take it to a reputable automotive repair shop for a proper diagnosis and repair.
