What can be a consequence of a faulty oxygen sensor?

A faulty oxygen sensor plays a crucial role in the engine's air-fuel mixture management. When functioning properly, the oxygen sensor provides the Engine Control Unit (ECU) with real-time data about the oxygen levels in the exhaust gases. This information allows the ECU to adjust the fuel mixture for optimal combustion.

When the oxygen sensor malfunctions, it may send incorrect readings to the ECU. This can lead to an overly rich or lean fuel mixture, causing the engine to consume more fuel than necessary. The increase in fuel consumption directly correlates with heightened exhaust emissions because incomplete combustion can produce more harmful pollutants. Therefore, a faulty oxygen sensor can significantly affect both fuel efficiency and environmental compliance, leading to greater fuel consumption and increased emissions.

In contrast, while the other options may highlight various vehicle aspects, they do not accurately reflect the effects of a faulty oxygen sensor. An improved exhaust sound, accelerated tire wear, or enhanced horsepower are not direct consequences of oxygen sensor failure. Understanding the importance of the oxygen sensor can help in diagnosing fuel consumption and emissions issues effectively.