Common Reasons to Fail Emissions Testing

Common Reasons to Fail Emissions TestingFailing a smog or emissions test can feel like such a disappointment, but it happens quite often. Almost all vehicles must go through inspection and emissions testing to ensure they are not producing excessive amounts of harmful exhaust and to make sure they are safe to drive. Fortunately, many of the problems that cause vehicles to fail this test are rather inexpensive to fix! Here's a list of four the most common problems that cause many cars and trucks to fail emissions testing.

Bad Fuel Metering

In order to ensure a smooth running vehicle there are sensors that keep track of the amount of fuel that your vehicle uses and under what sort of conditions. If this computerized engine control unit or the fuel injection sensors fail or malfunction in some capacity the car will fail the test because of improper records.

Faulty EVAP System

EVAP, also known as the Evaporative Emission Control System, prevents gasoline vapors from escaping from the car, truck or SUV. This system will malfunction if there is a leak somewhere in the fuel line system, vacuum hoses or if there is a loose, cracked or broken gas cap. Be sure your gas cap is very secure before having this test completed!

Bad O2 Sensor

The oxygen sensor monitors the exhaust to see how much oxygen is being passed through the exhaust system in order to help create a proper air/fuel mix for the engine. If it malfunctions you may experience loss of engine power, decreased acceleration performance and much lower fuel efficiency. Of course the reason it can cause the vehicle to fail emissions is that it may allow for excessive amounts of toxic fumes to be released due to improper monitoring.

Rich Fuel Mixture

High levels of carbon monoxide will occur in the exhaust of your car if it is burning excessive amounts of fuel. This can be caused by a bad O2 sensor, Mass Air Flow Sensor or because of leaking fuel injectors.

If your car has failed an emissions test be sure to let a professional auto repair shop address the issue to ensure it doesn't happen again. For annual state inspections, including emissions testing in Gonzales, LA, head to All Tune and Lube. We offer complete state inspections that include checking lights, brakes, tires and state emissions testing. To schedule an appointment for this or any other type of auto repair in Gonzales don't hesitate to give us a call at (225) 590-5369 today.

All Tune & Lube Gonzales Blog

Written and Published By MORBiZ

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