Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
4.4.1 Description
This diagnostic monitors the long-term adaptions of the fuel system. If the adaptions exceed calibrated thresholds for a calibratable time then an appropriate DTC will be recorded.
This monitor operates continuously provided the entry conditions have been met. Any of the components that make up the fuel system and are individually monitored, like the oxygen sensors, fuel pressure sensor and fuel delivery system, must also themselves be in working order with no faults. The general operation of the monitor is shown below.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.