How can a malfunctioning oxygen sensor impact fuel efficiency?

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How can a malfunctioning oxygen sensor impact fuel efficiency?

A bad oxygen sensor can cause the engine to run too rich o r too lean, leading to poor fuel economy and increased emissions. Understanding this issue can help in maintaining optimal engine performance.

Lubaba asked on 12 Feb 2025 14:26:27 pm

1 Answer

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Car Mechanic Expert - on 12 Feb 2025 14:35:17 pm

Impact of a Bad Oxygen Sensor on Fuel Economy:

A faulty oxygen sensor can cause the engine to run too rich too much fuel o r too lean too little fuel, both of which negatively affect fuel efficiency.
When the engine runs rich, it wastes fuel, while running lean can cause engine misfires o r poor performance.
The sensor is responsible for monitoring exhaust gases and ensuring the correct air-fuel mixture is maintained, so a faulty sensor disrupts this process, reducing efficiency.

Have you experienced a noticeable in fuel efficiency o r increased emissions?