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.
DTC Set Criteria
2001 Mitsubishi Montero XLSSECTION DTC Set Criteria
- Engine is in closed loop air/fuel control. Engine coolant temperature is more than 14°F (-10°C). Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). Volume Airflow (VAF) sensor output frequency is 100 Hz or more. Code will set if long-term fuel trim continues to be more than 12.5 percent, or less than -12.5 percent, and short-term fuel trim continues to be more than 7.4 percent, or less than -7.4 percent, for 10 seconds.
- Engine is in closed loop air/fuel control. Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). VAF sensor output frequency is less than 100 Hz. Code will set if long-term fuel trim continues to be more than 12.5 percent, or less than -12.5 percent, and short-term fuel trim continues to be more than 12.4 percent, or less than -12.4 percent, for 5 seconds.
- Engine is in closed loop air/fuel control. Intake air temperature is more than 14°F (-10°C). Barometric pressure is more than 11 psi (76 kPa). VAF sensor output frequency is 100 Hz or more. Code will set if long-term fuel trim continues to be more than 12.4 percent, or less than -12.4 percent, and short-term fuel trim continues to be more than 7.4 percent, or less than -7.4 percent, for 5 seconds.
- Engine is in closed loop air/fuel control. Left front Heated Oxygen Sensor (HO2S) is active. Code will set if long-term fuel trim continues to be more than 12.5 percent, or less than -12.5 percent, and short-term fuel trim continues to be more than 25.5 percent, or less than -30.5 percent, for 5 seconds.
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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.