Can a Faulty Oxygen Sensor Affect Toyota Hilux Fuel Efficiency?

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Can a Faulty Oxygen Sensor Affect Toyota Hilux Fuel Efficiency?

A failing oxygen sensor can cause the engine to run rich, leading to poor mileage. Have you experienced this issue, and how did you fix it?

Qalb E Momin asked on 11 Feb 2025 14:21:04 pm

1 Answer

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Car Mechanic Expert - on 11 Feb 2025 14:23:55 pm

Yes, a failing oxygen O2 sensor can lead to poor fuel economy.

Symptoms of a Bad O2 Sensor:
Reduced mileage due to incorrect fuel-air mixture.
Black smoke from the exhaust engine running rich.
Check Engine Light CEL illuminated.

Solution:
A faulty O2 sensor can reduce mileage by 10-15%.
Replacing a defective sensor restores fuel efficiency and costs $50-$150 depending on the model.