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Lambda Sensor Warning Indicator Symbol

Lambda Sensor IndicatorThis 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 amber colors, not to mention a letter from the Greek alphabet, and is seen only in older vehicles. 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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