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: Description
Bendix systems use a Renix controller. Renix Engine Control Unit (ECU) can be identified by connectors. See Fig 1 . Oxygen (O2) sensors used on Renix-controlled 1986-90 2.5L and 1987-90 4.0L engines are Titania O2 sensors. Instead of being a voltage generating O2 sensor (Zirconia type), Titania O2 sensors vary resistance in relation to oxygen content in exhaust. All Titania O2 sensors are 3-wire, but not all 3-wire O2 sensors are Titania O2 sensors. Titania O2 sensors are not vented to the atmosphere.
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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.