4 Common Reasons Your BMW will Fail Emissions Testing


4 Common Reasons Your BMW will Fail Emissions TestingIn order to legally register your BMW it must pass smog or emissions testing. Modern vehicles have complex emission control systems designed to reduce the hazardous fumes produced by gasoline engines in an effort to protect our natural environment and the air we breathe. If a part of this system is malfunctioning it will cause your BMW to fail emissions testing and require you to complete some sort of auto repair in order to keep your car legally on the road. These are four of the most common reasons for a failed emissions test.

Rich Fuel Mixture

Excessive levels of carbon monoxide will be produced if your BMW is using more gasoline than necessary. If this is detected during emissions testing your vehicle will fail. This usual reason for this to occur is due to leaking fuel injectors or a faulty Mass Air Flow sensor.

Faulty O2 Sensor

If the oxygen sensor can not properly monitor exhaust fumes to detect how much oxygen is being carried through the engine and out of the exhaust system your vehicle will again begin to use more gas than necessary, as increased oxygen levels will tell the computer to use more gas. The faulty O2 sensor will cause an increase in hazardous fumes being emitted from the tailpipe, which is why the vehicle will fail.

Incorrect Fuel Metering

If the computer aided fuel injection or computerized engine control unit malfunctions the monitoring of the air/fuel mixture will be thrown off, often resulting in excessive fuel burnoff, which will cause the vehicle to fail the test.

Failed EVAP System

The Evaporative Emission Control System (EVAP), is designed to prevent gas vapors from being released into the air. This system will fail due to a leak in a connected vacuum hose or because of a cracked, broken or loose gas cap.

If your BMW has failed an emissions test it is necessary to contact a professional BMW repair center for repairs. To schedule an appointment for expert BMW emissions repair in Euless or throughout West Dallas contact DFW Bimmer. Our factory trained BMW repair technicians service all years and models of BMWs, and can fix any issue your car or SUV is suffering from, including emissions issues. To learn more about our services or to request an appointment for expert BMW repair in Dallas or Fort Worth give us a call at (817) 440-3697 today.

DFW Bimmer Blog

Written and Published By MORBiZ

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