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4 Common Reasons for Failed State Emissions Testing


4 Common Reasons for Failed State Emissions TestingEmissions standards seem to be growing tougher every year. This means that even the slightest miscalculations by your car's engine and emissions system can end up causing a failure of its necessary legal testing. Fortunately, many of the problems that end with vehicles failing are small issues that can be resolved rather quickly. These are four of the most common emissions control problems that may require emissions repair.

Failing EVAP System

One of the most common issues has to do with the Evaporative Emission Control System, or EVAP, which prevents gasoline vapors from being released into the air from your vehicle. A broken, cracked or loose gas cap or a vacuum leak in the system will cause it to malfunction, resulting in a failed emissions test.

Bad Fuel Metering

Your car monitors fuel use in order to ensure that a proper air-fuel mixture is created within the engine to keep it running smoothly. If the computerized engine control or fuel injection unit fails or otherwise malfunctions the monitoring will be out of sync, which will cause the vehicle to fail because of an increased use of gasoline.

Bad O2 Sensor

A malfunctioning O2 sensor will not be able to properly monitor exhaust fumes. This sensor also helps to ensure a proper air-fuel mixture, and if it isn't detecting oxygen, or detects too much, it can cause overheating, poor acceleration or a loss of engine power. The reason the car will fail emissions is because a faulty oxygen sensor will result in increased emissions due to excessive burning of gas.

Rich Fuel Mixture

Carbon monoxide is the major pollutant produced by gas burning vehicles. If excessive amounts of it are detected in the vehicle, which occurs if your vehicle is burning too much gasoline, a problem known as running rich, your vehicle will not pass emissions. This problem is often caused by a faulty mass air flow sensor.

At Kwik Kar of Watauga we offer official state inspections for Texas, which includes emissions testing. If your vehicle fails the test, we can provide expert emissions repairs in Watauga for any make or model. Our auto repair experts utilize the latest diagnostics to ensure proper services are completed. To learn more, or to schedule any type of auto repair in Watauga, give us a call at (817) 519-8512 today.


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Written and Published By MORBiZ