Yaris Hybrid Oxygen Sensor Fault

Check engine light on my 2016 Toyota Yaris Hybrid, 167,809 kilometers. Error memory says oxygen sensor heater fault, and fuel consumption is up a bit. Read that a bad cable or plug might be the cause. Anyone seen this before?

4 comment(s)

Hey, yeah, that sounds familiar. Is it the upstream or downstream O2 sensor? Have you checked the wiring and the connector for any obvious damage or corrosion?

Thanks. I haven't checked which sensor it is yet. Could you tell me how to find the right sensor and how to check the wiring and connector?

No problem. Usually, the upstream sensor is before the catalytic converter and the downstream is after. Visually check the wires for breaks or melting. If you're not comfortable, a workshop will quickly diagnose it. Repair shouldn't be too expensive.

Thanks for the advice. I'll take a closer look at the wiring and connectors. Seems like I should probably get a workshop to check it out. Got an estimate for 95€, which seems okay. Thanks again.

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