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.
2009 Toyota Matrix S, AWDFACTORY OEM SERVICE PROCEDURE
Air Fuel Ratio Sensor: Inspection
- INSPECT AIR FUEL RATIO SENSOR
- Check the resistance.
- Using an ohmmeter, measure the resistance between the terminals.
Standard Resistance
RESISTANCE REFERENCETester Connection Condition Specified Condition +B - HT 20°C (68°F) 1.8 to 3.4 Ω HT-AF- - 10 kΩ or higher If the resistance is not as specified, replace the air fuel ratio sensor.
- Check the resistance.
Factory Service Tools
Use the Manual With the Right Hardware
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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.