What role does a lambda sensor play in fuel metering?

The role of a lambda sensor, also known as an oxygen sensor, is to measure the oxygen content in the exhaust gases emitted from the engine. This sensor plays a critical part in fuel metering by providing feedback to the engine control unit (ECU) regarding the air-fuel mixture being combusted.

When the lambda sensor detects the level of oxygen in the exhaust, it determines whether the engine is running lean (too much air) or rich (too much fuel). Based on this information, the ECU can adjust the amount of fuel being injected into the engine to achieve an optimal air-fuel ratio. This adjustment is essential for ensuring efficient combustion, which in turn helps improve fuel economy, reduce emissions, and enhance overall engine performance.

Other options do not accurately describe the function of the lambda sensor. The regulation of fuel pressure is typically handled by pressure regulators and the engine management system, while navigation systems rely on different sensors and technology entirely. Optimizing cooling system efficiency is unrelated to fuel metering and involves separate components designed to manage engine temperature. Thus, the lambda sensor’s primary function is focused on monitoring and adjusting the air-fuel ratio based on the oxygen levels detected in the exhaust.