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.
Sub-Oxygen Sensor Heater
Sub-oxygen sensor heater may be used on various models. See OXYGEN SENSOR APPLICATION table. Using ohmmeter, measure resistance between sensor terminals +B and HT. For terminal identification, see the SYSTEM/COMPONENT TESTS - 2.7L article. Replace sub-oxygen sensor if resistance is not 11-16 ohms at 68°F (20°C).
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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.