What is Smog? What Does it Have to do With Vehicles?

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Being eco-friendly there are many concerns about what products to use, how to use fewer resources, and importantly how to stop polluting our already taxed atmosphere. Automobiles are a significant source of pollutants especially those that use fossil fuels. For this reason, many lawmakers have cracked down on manufacturers, putting stringent guidelines on how much exhaust fumes can be expelled.

Smog when referring to automotive is the air pollutants that are harmful to everyone and the environment. The EPA, or Environmental Protection Agency, regulates the amount a car can have by enforcing smog checks or tests when it is time for vehicle registration or renewal. California is the only state that gets to adopt new standards to the emission rules. And guess what? California is the strictest state on the number of emissions a vehicle is allowed to emit. Other states can opt to use the Federal requirements or go as far as California, but that is saying something that states can have the choice between the federal or a stricter set of guidelines.

Smog starts from the exhaust ports of an engine. It is what is expelled after combustion and contains unburnt fuel along with gases. It will then flow through the system made up of exhaust tubing, catalytic converters, resonators, and mufflers. What your vehicle’s system has is unique to that specific model. Not every car utilizes the same setup, but all newer cars will have advanced parts that filter the gases that come from the engine.

Subaru is one manufacturer that takes emissions very seriously. They even offer a partial zero emissions vehicle that has the same great performance and AWD as their other models. The PZEV models have 90% fewer emissions that most newer cars on the market. PZEV Subaru models are apart of the EPA’s SmartWay Vehicles.

When taking your Subaru in for emissions testing, if it has a check engine light illuminated the car will fail, and you will need a smog repair done in order to pass. One standard issue, the oxygen sensors can fail. This will set off your check engine light and will cause the engine not to run as it should. The sensor is not able to give readings back to the car’s computer, so it will think it needs more fuel or sometimes less fuel. Running too rich or lean is the result and will produce more emissions, causing it to fail the smog test. To receive a passing smog test certificate your vehicle’s emission system needs to be fully operational and free from defects.

Keeping vehicles from expelling harmful gases into the air, is a complicated process. Many parts work together in a car’s exhaust system to keep emissions low. If you’re in need of smog repair assistance, you will need to visit a professional technician to identify where in the system there is a problem to fix it correctly. Some signs your Subaru may fail the emission test include running rough at idle, poor fuel economy, exhaust noises (having an exhaust leak, and a bright check engine light on the dash.


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