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Tag Archives: failed emission test codes

Failed Emission Test Codes: Most Common Trouble Codes

P0300 - Engine Misfire Detected (random Misfire)

Based on Illinois Environmental Protection Agency data test, the most common trouble codes that cause an OBD II plug-in emissions test failed on many vehicles and make the Check Engine light on would be fouled or a worn out catalytic converter. More common trouble codes that cause vehicles fail on emissions test and make the Check Engine light coming on can found below. Description Percentage Trouble Code Coolant Thermostat 3.1% P0128 Oxygen (O2) Sensor Slow Response Bank 1, Sensor 1 …

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