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Saturn L300 Oxygen Sensor

Common Concerns with the Saturn L300 Oxygen Sensor

Designed to detect if the mixture of air and gasoline going into your car's engine is either rich or lean, the Saturn L300's oxygen sensor helps your engine perform efficiently while producing better emissions. Oxygen sensors work hand-in-hand with your car's ECU and, if the sensors detect a problem with the fuel and air mixture, the ECU will automatically adjust the mixture before it enters the engine. But if the oxygen sensor fails, the ECU won't be able to determine the correct fuel and air ratio. This leads to poor engine performance and higher fuel consumption. Once these concerns arise, it's time to do some troubleshooting. Here are some common oxygen sensor concerns encountered by Saturn L300 owners, and the possible factors behind them:

Rough idle

Oxygen sensors can control some of your car's engine functions. These functions range from engine combustion intervals, engine timing, and most especially the fuel and air mixture entering the combustion chamber. Now, if the oxygen sensor fails, it will start to disrupt these processes and the engine will run roughly. When this concern arises, check your car's oxygen sensor for any signs of damage or contamination. If the sensor is already damaged, purchase a new one, and replace it immediately.

Engine chokes

If your car's engine starts to miss or choke at times, it could be due to a malfunctioning oxygen sensor. Since this sensor regulates the engine's air and fuel mixture, and carbon deposits can build up in the sensor which affects the engine's normal combustion. You can remove the oxygen sensor and clean it with gasoline. This will remove sulfur, carbon, and other deposits from it.

Increase in fuel consumption and emissions

A malfunctioning oxygen sensor will affect the engine's fuel delivery and combustion system. More fuel is pumped into the engine's combustion chamber, resulting in an increase in fuel consumption. Also, since the oxygen sensor is unable to accurately measure the engine's air/fuel mixture, this leads to an increase in vehicle emissions. Nitrogen-oxide rich pollutants are now released into the atmosphere. It's better to replace your car's oxygen sensor with a new one to improve its emissions and restore proper fuel consumption.

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  • How to Keep Your Saturn L300 Oxygen Sensor in Good Condition 27 February 2013

    Regulating an engine's fuel and air mixture, the Saturn L300 oxygen sensor is an essential tool in improving your car's overall performance. Oxygen sensors constantly monitor the oxygen content in your engine's exhaust gases. If there is too much oxygen in the exhaust gas, it could lead to engine misfires and chokes. A rich fuel mixture on the other hand, increases exhaust emissions and your engine wastes far too much fuel. Since oxygen sensors are constantly exposed to physical shock, soot, carbon, harmful emissions, chemicals, and anti-freeze, preventive maintenance is the key to avoid engine problems. To ensure that your car's oxygen sensor will live up to a 100,000 miles, follow these simple maintenance tips:


    Check the engine bay for leaks.


    Before you remove the oxygen sensor, it's best to check the entire engine bay for leaks. A good place to start will be the exhaust manifold. Check the area for leaking oil and anti-freeze. Next, inspect the fuel injectors, and check for possible fuel leaks. Then, check the engine's spark plugs and ignition components. Contaminants like fuel, oil, anti-freeze, and carbon deposits can build up on the oxygen sensor. Fixing leaks will decrease the chances of contamination, and it will lengthen the sensor's service life.


    Soak it up and always keep it clean.


    If you see tar, oil, carbon, or sulfur building up inside your car's oxygen sensor, it's best to remove the buildup before it's too late. These contaminants can decrease the sensor's efficiency and damage it permanently. Soak the oxygen sensor in gasoline overnight to remove the contaminants. This will loosen the sulfur, carbon, oil, and tar from the sensor. Use paper towels to dry the sensor before reinstalling it into your engine. Never use water and solvents to clean oxygen sensor. These can cause severe damage to the highly sensitive sensor equipment.


    Follow preventive maintenance procedures.


    Unknown to most car owners, oxygen sensors have a recommended service life. An unheated, one- or two-wire oxygen sensor must be replaced every 30,000 to 50,000 miles. The heated three- or four-wire oxygen sensor needs replacement every 60,000 miles. For heated oxygen sensors, usually installed on newer vehicles, they need to be replaced every 100,000 miles. Follow these preventive maintenance procedures to avoid engine and catalytic converter damage.