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Reasons For Failure
What Types of Equipment Malfunctions
Could Cause My Vehicle to Fail the Emissions Test?
It is advisable to use Certified Emissions Repair Technicians,
certified by the Connecticut Department of Motor Vehicles (DMV),
to repair your vehicle so it will pass the Connecticut Emissions
Test. They have been specially trained to diagnose and repair
emissions failures.
There are 11 different vehicle systems that affect the outcome
of an emissions test. Each system has multiple parts including:
- The Air Induction System (air ducts, intake manifold, etc.);
- The Fuel Metering System (carburetor if so equipped, fuel injectors
if not, etc.)
- Ignition System (spark plugs, etc.)
- Exhaust Gas Recirculation System - EGR (speed sensors, etc.)
- Positive Crankcase Ventilation System - PCV (PCV valve, oil
filter cap, etc.)
- Fuel Evaporative Control System - EVAP (fuel tank, fuel lines,
gas caps, etc.)
- Secondary Air Injection System (temperature sensors, etc.)
- Exhaust System (catalytic converters, exhaust manifold, etc.)
- Engine Emission Control System Sensors (oxygen sensors, air
conditioner sensors, etc.)
- On-Board Diagnostics - OBD (service
reminder system, etc.)
- Related Parts (hoses, switches, gaskets, etc.)
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