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Lexus LS400 Oxygen Sensor

Common Causes of Lexus LS400 Oxygen Sensor Problems

Every component of your Lexus LS400 is specifically engineered to give you the best possible driving experience. One of these especially crafted parts is the oxygen sensor. Your Lexus LS400 oxygen sensor is tasked to regularly monitor and measure the oxygen level in the exhaust gases emitted by your engine so that the computer can adjust the air and fuel mixture accordingly. Maintaining the ideal air to fuel ratio is essential in achieving your Lexus' optimum driving power and acceleration, but doing this task constantly makes the oxygen sensor prone to rapid deterioration. Below are some of the most common problems encountered by Lexus LS400 oxygen sensors and their usual causes:

Decrease in fuel efficiency

A defective oxygen sensor will lead to a significant decline in your Lexus' fuel economy. When the oxygen sensor goes bad, the amount of air flow that enters the engine is reduced. This will result in an increase in the amount of gasoline used for combustion, which will obviously use up all the gasoline in your fuel tank in a shorter period. So before you end up with an empty wallet because of high fuel prices, have your broken stock replaced with a new Lexus LS400 oxygen sensor.

Increase in vehicle emissions

If your oxygen sensor fails, you might end up with a failing grade of "F" in your state's emissions test. The O2 sensor's inability to maintain the ideal ratio between the air and fuel will result in a rich or lean mixture. These two types of mixture indicate an imbalance in the fuel and air's combination in the engine, which will definitely lead to an increase in your vehicle's emissions level.

Poor engine performance

Driving your Lexus with a faulty oxygen sensor may cause the vehicle's top-notch engine to misfire or backfire. Apart from a sluggish response everytime you step on the accelerator, a rich or lean gas mixture caused by the oxygen sensor trouble will alter the normal "explosion" of the engine, which starts the combustion and processing of the gasoline. If you hear a deafening bang near the intake manifold, it means that your Lexus' engine backfired, and you are in for a really expensive, wallet-emptying engine repair.

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  • Essential Care Tips for a Well-maintained Lexus LS400 Oxygen Sensor

    The oxygen sensor is probably one of the most in-demand components of your Lexus LS400. This busy bee works double time just to maintain your car's smooth and hassle-free drive, reduce its fuel consumption, and keep the emissions level at a minimum. Although this particular car part is always being used, it is very rare for the Lexus LS400 oxygen sensor to suddenly breakdown. Usually, its deterioration happens slowly over time, so if you perform proper maintenance on your stock, you can still prevent the damage it may inflict on your elegant sedan's engine. To help you out, here are some of the most effective ways to keep your oxygen sensor in its best shape:


    Examine the oxygen sensor regularly.

    Performing regular checks on your oxygen sensor can help you monitor its condition and efficiency. You have the option to test it while the vehicle is revved up, but it is recommended to examine it while the engine is off so that you can remove the oxygen sensor from its mount and check it more closely. You can begin by inspecting the sensor's body for physical damage or corrosion. Usually, a damaged sensor is no longer capable of performing its job well. In this case, replacing the stock is highly recommended. You also need to habitually check the wires attached to and from the oxygen sensor. These connections must always be appropriately routed, and they should be damage-free at all times.


    Keep the oxygen sensor clean and rust-free.

    Your oxygen sensor is exposed to a very messy and exhausting working environment on a regular basis, so it is unavoidable for contaminants to accumulate on the tip and surface of the sensor. If you will not do something about this, your engine will become sluggish after some time. Cleaning your oxygen sensor regularly can help you prevent this from happening. The process is very easy, and you can even do it at home. You only need to submerge the sensor in a gas-safe container filled with a significant amount of gasoline and leave it there overnight. It is also advisable to shake the container gently to re-agitate the fuel and let it swirl inside the sensor to wash away the dirt.


    Test the oxygen sensor's efficiency.

    To guarantee your oxygen sensor's effectiveness, you can test it using a voltmeter set to the 1 volt scale. Make sure your vehicle is warmed up before connecting the oxygen sensor to the voltmeter. The reading of the voltmeter should fluctuate rapidly between 0.1 to 1.0 volts if the engine is warm. If the reading does not change or if it stays at 0.5 volts, your oxygen sensor is in trouble.


    Replace the oxygen sensor if needed.

    If all the preventive maintenance tips did not work, or if the sensor is physically damaged, do not hesitate to replace it immediately. After all, an oxygen sensor is not really expensive, and it can be easily changed at home without the help of a professional mechanic. Remember, it is better to spend a couple of bucks on your broken stock's immediate replacement than to suffer severely with high fuel consumption and total engine failure, which will definitely cost you more.