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.
Titania Oxygen Sensor Testing: Operation
A 5-volt reference voltage signal is sent through a fixed resistor internal to Renix ECU. See Fig 1 . The output from the resistor is monitored by ECU. The reference voltage is connected to input of O2 sensor. Unlike zirconia O2 sensors, when oxygen content is low (rich mixture), voltage signal is less than 2.5 volts. When oxygen content is high (lean mixture), voltage signal is more than 2.5 volts.
Titania O2 sensors are heated. Voltage is supplied to heating element by a PCM-controlled relay. Titania O2 sensor heating element resistance is 5-7 ohms. Titania O2 sensor output should be similar (response time, cross counts), except for voltage. Instead of 0-1 volt, low voltage equals lean (Zirconia), Titania O2 sensor voltages are 1-5 volts, high voltage equals lean.
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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.