Lambda Sensor Warning Indicator Symbol

Lambda Sensor

This is the Lambda Sensor Warning Indicator symbol. The symbol says that the exhaust gas oxygen sensor is dirty or inoperative. The vehicle should not be driven for any length of time in this condition as this sensor is key to controlling the oxygen to fuel ratio in your engine. The Greek letter lambda looks like an upside down Y and it is shown in a triangle.

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The symbol is an odd mix of green and yellow/amber colors, not to mention a letter from the Greek alphabet, and is seen only in older vehicles. Yellow/amber is a warning color while green is intended to inform and not to warn. The Check Engine Light is used to covers this fault in later models.

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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the  use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.

These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.

Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.