Are faulty oxygen sensors in Karvaan responsible for poor fuel average in Pakistani variants?

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Are faulty oxygen sensors in Karvaan responsible for poor fuel average in Pakistani variants?

Multiple owners in Pakistan have complained about sudden s in fuel efficiency. Is a failing O2 sensor the main culprit, and how often should it be inspected o r replaced?

Sirat Ul Jinan asked on 06 Aug 2025 15:54:29 pm

1 Answer

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Car Mechanic Expert - on 06 Aug 2025 16:05:50 pm

Yes. A failing Oxygen O2 sensor:

Sends incorrect air-fuel ratio data to the ECU

Causes over-fueling o r under-fueling, leading to poor fuel economy

Signs: Increased fuel consumption, black smoke, sluggish throttle
When to replace: Every 40,000–60,000 km o r earlier if check engine light appears