TechBit No.11 - Oxygen sensor, or lambda sensor, fuel injection system.

The oxygen sensor (also called a lambda sensor)

A bad oxygen sensor will continually tell the computer that the engine is too lean, and the computer will respond by sending more fuel. This is bad, not only for fuel economy and emissions, but a rich mixture will eventually burn out your catalytic converters, possibly causing a fuel fire inside the exhaust system, which can then spread to the rest of your car. It's a bad thing.

According to Jaguar and the other auto manufacturers, the oxygen sensor should be replaced every 30,000 miles to ensure troublefree performance.

There are two different types of oxygen sensors, sensors with one wire and sensors with three wires. The three wire sensors have a built-in heating element that brings the sensor up to operating temperature quickly. When you replace the sensor, be sure to get the correct type for your car. If your Jag is less than 5 years old, you may be able to get the oxygen sensor replaced under warranty, even if the warranty for the rest of the car has expired. It's worth checking out. The V12-equipped cars have two oxygen sensors, while the six-cylinder cars only have one.

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