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 MANUALSTOYOTA2009YARIS S, 4D HATCHBACKREPAIR AND DIAGNOSISENGINE MECHANICALAUXILIARY EMISSION CONTROL SYSTEMSAIR FUEL RATIO SENSORINSPECTION
2009 Toyota Yaris S, 4D Hatchback
Air Fuel Ratio Sensor: Inspection
2009 Toyota Yaris S, 4D HatchbackSECTION Inspection
- INSPECT AIR FUEL RATIO SENSOR
- Check the resistance.
- Using an ohmmeter, measure the resistance between the terminals.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITIONTester Connection Specified Condition 1 (HA1A) - 2 (+B) 1.8 to 3.4 ohms at 20°C (68°F) 1 (HA1A) - 4 (E2) 10 k ohms or higher If the resistance is not as specified, replace the sensor.
- Using an ohmmeter, measure the resistance between the terminals.
- Check the resistance.
RENDER: 1.0x
NO RELATED
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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.