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EGR vacuum hoses on a lot of cars are prone to collecting moisture inside them that freezes in cold weather. When the computer commands the valve to open and nothing happens it will turn the light on - it usually takes two consecutive drive cycles, on most cars, to set the light.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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