- Faulty oxygen sensor
- Vacuum leak
- Faulty fuel pressure regulator
- Faulty mass air flow (MAF) sensor
- Faulty temperature sensor
- Faulty fuel injector(s)
- Engine mechanical issues (such as worn piston rings or valve seals)
Potential fixes:
- Replace the faulty oxygen sensor
- Fix the vacuum leak
- Replace the faulty fuel pressure regulator
- Replace the faulty MAF sensor
- Replace the faulty temperature sensor
- Replace the faulty fuel injector(s)
- Repair the engine mechanical issues
Additional tips:
- Check the fuel pressure to ensure it is within specifications
- Check the fuel filter to ensure it is not clogged
- Clean the throttle body and intake manifold
- Inspect the spark plugs and wires to ensure they are in good condition
- Check the exhaust system for any leaks or restrictions
- Have a professional mechanic diagnose the issue if the cause is not immediately apparent
