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Emission System Repairs Thornton, Failed Emissions Test

Mountain View Automotive, Thornton Colorado, 80229


failed emission test repairs Thornton Colorado

Diagnosis of high emissions can be an involved process that usually requires special tools and measuring equipment. However, armed with a test report indicating what gases are high can help you determine what systems may not be functional. If the vehicle has failed as a result of high CO and HC, the CO failure should be diagnosed first. If the “Service Engine Soon” or “Check Engine” light is on it should be diagnosed prior to any emissions diagnosis. CO Failure is the result of an excessively rich air fuel mixture. The following is a list of the most common causes:

  • Defective Oxygen Sensor
  • Inoperative Air Injection System (if equipped)
  • Leaking or defective Fuel Injectors
  • Restricted air filter (especially if high CO is present only at high RPM)
  • Vacuum leaks resulting in improper MAP sensor operation
  • Defective air mass or air flow sensor
  • Malfunctioning fuel evaporation system or purge valve
  • Defective Catalytic Converter
  • Defective thermostat (cooling system), thermostat stuck open
  • Oil contaminated with fuel, excessive miles between oil changes


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