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The SafetyTech Emission Warning Light monitors exhaust emissions using an exhaust mounted 

oxygen sensor. If the engine is running a rich air to fuel ratio, which can cause high levels of carbon monoxide, the red LED will illuminate for 90 seconds. If the rich running condition continues, the EMS will automatically shut the engine down. 

From $99.95 

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Oxygen sensor monitors exhaust emissions 
indicating when air filters need replacement.

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