1. Air pressure sensor. 2. Air temperature sensor. 3. Ignition coils. 4. Throttle. 5. Upper oxygen sensor 6. Lower oxygen sensor. 7. Engine control unit 8. Relay unit. 9. Crankshaft position sensor. 10. Coolant temperature sensor. 11. Knock sensor. 12. Fuel injectors 13. Fuel rail 14. Solenoid valve for fuel recirculation system. 15. Fuel vapor absorber.