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Mitsubishi Eclipse Oxygen Sensor

Mitsubishi Eclipse Oxygen Sensor: The Usual Issues that Cause Malfunction

The oxygen sensor of your Mitsubishi Eclipse determines the proportion of fuel and air and relays this information to the fuel control computer. When the sensor starts to malfunction, symptoms like poor gas mileage, increase in emissions, and rough engine idling will begin to show. If you notice that your vehicle is acting weird, you'd better do some troubleshooting to determine if a faulty oxygen sensor is causing the problem. Here are some of the common issues you might encounter:

Increased vehicle emissions

If the Mitsubishi Eclipse oxygen sensor fails to determine the correct fuel-to-air ratio, it can contribute to the increase in the vehicle's smoke emissions. The unnecessary amount of fuel sent to the engine will leave excess fuel that will later turn into toxic gases. This can also contribute to low engine performance because the flow of the exhaust gases is blocked. A good way to prevent this from occurring is by replacing the oxygen sensor every 100,000 miles. This will also make sure that your vehicle passes the required emission test and other regulations.

Sudden increase in fuel consumption

Another symptom of a malfunctioning oxygen sensor is the increase in fuel consumption. This happens when the oxygen sensor determines a higher proportion of fuel and a lesser proportion of air which is also called a "rich mixture." A rich mixture is bad because it will only result to unburned fuel that can clog the flow of the exhaust fumes. On the other hand, a higher proportion of air with a lesser proportion of fuel which is called a "lean mixture" is not as critical as the rich mixture, but it is still considered a malfunction. You have to check the oxygen sensor immediately before you spend a lot of money on wasted fuel.

Rough engine idling

A faulty oxygen sensor can cause rough engine idling because it disrupts the correct engine timing and engine combustion intervals with the wrong fuel-to-air ratio. Although there can be other reasons of rough engine idling, you should include the oxygen sensor on the list of parts to check. The sensor may be clogged with contaminants like lead and carbon that's why it can't function properly.

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  • Mitsubishi Eclipse Oxygen Sensor: Useful Tips to Reach a Longer Service Life 27 February 2013

    The oxygen sensor of your Mitsubishi Eclipse measures the correct fuel-to-air ratio so that the engine receives the right amount of fuel to perform efficiently. However, the oxygen sensor will experience wearing down because of the constant high temperature and pressure inside the car's exhaust system. Despite of that, you can still maximize the sensor's service life with the help of these maintenance tips listed below:


    Clean your Mitsubishi Eclipse oxygen sensor.


    Over time, your car's oxygen sensor may show signs of malfunction because of the carbon deposits and other sediments that's blocking some of the sensor's sensitive parts. Before you head out and spend your money for a replacement, you should take a look at the sensor first because what it needs is probably a good cleaning to improve its performance. An effective way of cleaning your car's oxygen sensor is by submerging it in a container filled with gasoline. Leave the sensor in the container over night and dry it the next day using paper towels. You should use rubber gloves when removing the sensor to keep the gasoline off your hands.


    Check the oxygen sensor's voltage.


    You can check the condition of your car's oxygen sensor by checking its voltage using a voltmeter. But before you start, you need to know the operating voltages of the oxygen sensor for a Mitsubishi Eclipse. This information can be found in your vehicle owner's manual, or if it's not indicated there, you can ask a service mechanic in your local dealership. When you're ready to test the sensor, you can set the voltmeter and read the sensor's voltage for about a minute while the engine is running. The voltage reading has to be between 0.2 and 0.8 volts. Otherwise, the oxygen sensor could probably be wearing down.


    Replace the oxygen sensor when it's already faulty.


    With consistent and proper maintenance, your car's oxygen sensor can have a service life of 250,000 miles or beyond the lifetime of the vehicle itself. However, if the oxygen sensor keeps on showing problematic signs, then the best preventive maintenance you should do is to replace it immediately. Otherwise, the performance of the car and its fuel economy will suffer.