What causes the fuel consumption in my Suzuki Alto to increase because of a faulty oxygen sensor?

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What causes the fuel consumption in my Suzuki Alto to increase because of a faulty oxygen sensor?

I’ve been experiencing increased fuel consumption in my Suzuki Alto, and a mechanic suggested it could be due to a faulty oxygen sensor. How does a faulty oxygen sensor affect fuel efficiency, and how can I get it fixed?

Gari Specialist asked on 20 Feb 2025 14:35:27 pm

1 Answer

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Gari Master - on 20 Feb 2025 14:38:33 pm

A faulty oxygen sensor in your Suzuki Alto can lead to increased fuel consumption because it plays a crucial role in controlling the air-fuel mixture. The sensor monitors the oxygen level in the exhaust gases and sends this information to the engine control unit ECU. If it malfunctions, the ECU cannot adjust the fuel mixture properly, which can result in too much fuel being injected into the engine.

How a faulty oxygen sensor affects fuel efficiency:

A malfunctioning oxygen sensor may cause the engine to run rich too much fuel rather than stoichiometrically the optimal air-fuel ratio, leading to excessive fuel consumption.
A faulty sensor can also cause the engine to run with improper emissions control, leading to inefficiency and increased fuel use.
How to fix it:

Diagnose the oxygen sensor: Use an OBD-II scanner to check for any error codes related to the oxygen sensor.
Replace the faulty oxygen sensor: If the sensor is defective, replacing it should restore normal fuel consumption and engine performance.
Clear the error codes: After replacing the oxygen sensor, reset the system to clear the check engine light and error codes.