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P0673 and P140A
p140a-Exhaust Gas Recirculation (EGR) Cooler Bypass Position Sensor Exceeded Learning Limit There is a special coverage on the egr bypass valve for 10 years or 120,000 miles Condition- On some 2011 model year Chevrolet Silverado 3500 HD or 2011 GMC Sierra HD vehicles, the Service Engine Soon...