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.
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HOMESERVICE MANUALSMITSUBISHI2001MIRAGE LS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0136: HO2S CIRCUIT MALFUNCTION (SENSOR 2)DTC SET CRITERIA (1.8L)
2001 Mitsubishi Mirage LS, 4D Sedan, Standard
DTC Set Criteria (1.8L)
2001 Mitsubishi Mirage LS, 4D Sedan, StandardSECTION DTC Set Criteria (1.8L)
- HO2S signal voltage is 100 millivolts or less for 3 minutes or more after engine is started. Engine coolant temperature is 180°F (82°C) or more. Engine speed is more than 1200 RPM. Volumetric efficiency is 25 percent or more. Monitor runs once per trip for 7 seconds. Code will set if input voltage to ECM interface circuit is 4.5 volts or more when 5 volts is applied to HO2S output line through a resistor.
- HO2S signal voltage is 100 millivolts or less for 3 minutes or more after engine is started. Engine coolant temperature is 180°F (82°C) or more. Engine speed is more than 1200 RPM. Volumetric efficiency is 25 percent or more. Front HO2S output voltage is 500 millivolts or more, and at least 20 seconds have passed since fuel shut-off control was released. Output frequency of Volume Airflow (VAF) sensor is 81 Hz or more (1.8L). Monitor runs once per trip for 10 seconds. Code will set if HO2S output does not increase 100 millivolts or more in response to ECM making air-fuel ratio 15 percent richer.
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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.