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Minneapolis Auto Repair

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Tag Archives: Engine Misfire

Check Engine Light

Check Engine Light

A "check engine" or "service engine soon" light can mean many various things, from a misfiring engine to a loose gas cap. Below are the five most common reasons a check engine light will be displayed: 1. Replace the Oxygen Sensor An oxygen sensor monitors the unburned oxygen from the exhaust. The oxygen sensor monitors combusted fuel. A faulty sensor means it is not providing the right data to your car's computer and causes a decrease in gas mileage. What causes a faulty sensor?  The sensor gets covered in oil ash over time and reduces the sensors ability to alter the oxygen and fuel mixture. A faulty sensor not only reduces gas mileage, but it also increases emissions. What you should do Not replacing a broken oxygen sensor can eventually lead to a broken catalytic converter. 2. Loose or Faulty Gas Cap A cracked or loose gas cap will cause the fuel vapors leak out, and can throw the entire fuel system off.  A loose gas cap causes a reduction in ... read more