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3 Common Reasons Why Your Check Engine Light is On

The dreaded orange light has come on suddenly and you feel a rush of panic. Is it my engine, you wonder? Is it about to fail? A check engine light is a dreaded sign for many drivers on the road today, but it often isn’t as serious as you think! Sure, sometimes it’s a big expense, like a catalytic converter failing, but often it’s something simple. So, what are some common check engine light causes? Continue reading to find out!

1. Faulty O2 Sensors

A part that works with the catalytic converter, and often shows up as a catalytic converter failure on code readers, is the oxygen sensor. The oxygen sensor, also known as the O2 sensor, measures the amount of unburnt oxygen in your exhaust system. A failing sensor can cause the check engine light to be triggered, though you can continue to drive relatively fine with it.

Over time it will cause more fuel consumption and damage to the catalytic converter, however, and so re recommend replacing it as soon as possible. It costs about $175 for a quality O2 sensor, but labor prices will vary greatly depending on vehicle type.

Tires placed side by side

Engine view of a vehicle

2. Loose or Damaged gas Cap

Yes, you read that correctly. A loose or damaged gas cap can be one of the most common reasons why the check engine light turns on. This often shocks some younger drivers, particularly those that aren’t very mechanically inclined, but there is a good reason for this. The gas cap plays a very important role in your fuel delivery system. It prevents gasoline from leaving the fuel tank and keeps the system under the right pressure to ensure optimal performance. This is a very cheap and easy part to replace as it’s about $15 for a new cap at your local auto parts store.

3. Bad Spark Plug Wires

The spark plug wires transfer electricity from the coil to the spark plug. Without them, the fuel and air in your engine’s cylinders wouldn’t ignite and you wouldn’t have a functioning engine. Symptoms of bad spark plug wires are often a rough idle, poor engine performance, lower fuel economy, etc. Thankfully, these wires aren’t too expensive to replace as they are about $50 for a new set.

Read More: 2020 Lexus LS Luxury and Comfort Features

These are just some of the most common, and least expensive, causes of a check engine light coming on. There are a variety of reasons this alert might appear on your dash and so we recommend taking your vehicle to a trusted mechanic, like the ones at our service center, for the best results. Contact our dealership today to schedule routine maintenance or to have an inspection done!

Sours: https://www.lexusofmemphis.com/blog/3-common-issues-that-cause-a-check-engine-light/

Lexus Oxygen Sensor

The Lexus Oxygen Sensor monitors the ratio of air and fuel in the exhaust and reports it to the engine control unit (ECU). The ratio of air and fuel that gives maximum efficiency is called a “perfect ratio”. There are two possible mixtures of air and fuel in the combustion chamber: rich and lean. The mixture is rich when the amount of air is less than that of the perfect ratio and is lean when there is excess air than that of the perfect ratio. If these mixtures are detected, the fuel injection is regulated to maintain a perfect air-fuel ratio.

If your Lexus Oxygen Sensor is not functioning properly, you must replace it as soon as possible. Buy Auto Parts has a wide range of car parts for every car make and model. We sell genuine OEM replacements and premium aftermarket parts at unbeatable prices. Each of our car parts has been tested to meet or exceed industry standards. We provide free shipping on all orders above US $99.

Ordering auto parts online has never been easier. To find the car parts you need, just select the right year, make and model of your car on our online catalog. If you encounter difficulties in finding the Oxygen Sensor for your Lexus, give us a call and we will find it for you. As we have warehouses all across the country, you can be assured of receiving the ordered parts on time.

Taking care of our customers is our top priority, and our great online customer reviews prove this. To know more about our services and car parts, you can call our toll-free support line at 1-888-907-7225 or email us at [email protected]. Our US-based auto specialists are here to answer all your questions regarding our car parts.

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Bad O2 Sensor Lexus IS 300

Oxygen sensors play a vital role in both engine management and emissions control.  When an O2 (oxygen) sensor go bad, it’ll cause your Lexus IS 300‘s engine to run less efficiently.

Your IS 300 can exhibit symptoms when the Oxygen sensor has gone bad.  Or, it may exhibit none at all. Often enough, the only sign of the problem at all is the service engine soon light being on.

The good news is, if you end up discovering that the oxygen sensor is bad, they really aren’t that expensive to replace.


Bad Oxygen Sensor Symptoms:  Lexus IS 300

Oxygen sensors can change the way that your IS 300’s engine runs.  Most of the time, the check engine light will come on.  It’s a good thing that the check engine light would come on, as there is more than one oxygen sensor, and they can be difficult to get to and test.

The trouble codes associated with the OBDII scan will reveal which sensor is at fault and why it is bad (at least what the computer thinks is wrong).  It is very rare for there to be a problem with an oxygen sensor, and not have the check engine light come on.

Lexus IS 300 Bad Oxygen Sensor Symptoms

Here are the most common symptoms of a bad oxygen sensor in your IS 300:


Service Engine Soon Light

More often than not, when an oxygen sensor in your IS 300 goes bad, it will throw a diagnostic trouble code.  There are many oxygen sensor related codes.

These codes correspond with what side of the engine they are on (known as the “bank” for cylinder bank) and how far down stream they are.  For instance, an oxygen sensor at bank 1 – sensor 1 would be:

  • Bank 1-  Side of the engine with the first cylinder in the firing order.  This means that you need to look up the firing order for your particular model year and engine.
  • Sensor 1-  Sensor 1 would be the first O2 sensor in the line of sensors starting with the exhaust manifold and making its way back to the exhaust pipe.  An Oxygen sensor that is between the catalytic converter and the engine is known as an “upstream” sensor.  Oxygen sensors after the catalytic converter are “downstream sensors”.   As a rule, the upstream sensor is more important for engine timing and air/fuel ratios.

By using a OBDII scanner you can determine exactly which sensor is bad, and what is wrong with it.


Loss In Fuel Economy

Your IS 300’s oxygen sensors are responsible for helping to keep your engine running at optimal efficiency.  The engine management computer uses the data from all of the O2 sensors to keep the air/fuel mixture optimized.  A bad oxygen sensor can affect the mixture greatly.

Without being able to optimize the air fuel ratio, combustion isn’t as efficient, and fuel mileage suffers.  There could also potentially be raw fuel that enters the exhaust.  This fuel can hurt the catalytic converter.


Bad Smelling Exhaust

One of the most common symptoms that an oxygen sensor has gone bad is exhaust that does not smell good.  The smell is often described as “rotten eggs” or sulfuric.  Either way, like with rotten food, “the nose knows”.


Engine Running Rough

Without the proper air/fuel mixture, your engine won’t run as smoothly as it should. This is especially true if the mixture ends up too lean.

While a rough running engine can be a sign of a bad oxygen sensor, it is often a sign of a misfire as well.


Failed Emissions

Often enough, there won’t be any noticeable signs of a bad oxygen sensor.  You’ll go to get an emissions check done, and your IS 300 fails the test.  Without a check engine light, it can be tough to lock down exactly what would cause the vehicle to fail, but oxygen sensors are one of the more common causes.


IS 300 Bad O2 Sensor Symptoms & Causes:  Conclusion

There may or may not be any noticeable symptoms when your Lexus IS 300’s oxygen sensor(s) go bad.  It is smart to use a scan tool to determine whether or not there is an OBDII trouble code associated with any of the sensors.  Good luck diagnosing your IS 300!


Categories Lexus IS 300Sours: https://www.700r4transmissionhq.com/bad-oxygen-sensor-symptoms-lexus-is-300/
How to Replace O2 Oxygen Sensor Lexus IS300 - P0141 P0161 P0135 P0155 - Heated Oxygen Sensor Circuit

Lexus IS250 Oxygen Sensor Replacement

As is always the case, the cost of the repair depends on the make, model, and year of your car.

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$90.58 Range for All Vehicles $1010.5

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RepairSmith offers upfront and competitive pricing. The average cost for Lexus IS250 Oxygen Sensor Replacement is $317. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.

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2007 Lexus IS250

2.5L V6 • 250,000 miles

Chino ,  CA 91710

$284 - $348

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2007 Lexus IS250

2.5L V6 • 250,000 miles

Chino ,  CA 91710

$284 - $348

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2015 Lexus IS250

2.5L V6 F Sport • 62,000 miles

Needles ,  CA 92363

$281 - $343

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2007 Lexus IS250

2.5L V6 • 135,000 miles

Pico Rivera ,  CA 90660

$279 - $341

Lexus logo

2007 Lexus IS250

2.5L V6 • 135,000 miles

Pico Rivera ,  CA 90660

$279 - $341

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2010 Lexus IS250

2.5L V6 C • 154,000 miles

Las Vegas ,  NV 89139

$286 - $350

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2009 Lexus IS250

2.5L V6 Base • 158,000 miles

San Diego ,  CA 92175

$301 - $367

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2013 Lexus IS250

2.5L V6 C • 106,000 miles

Huntington Park ,  CA 90255

$267 - $327

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2014 Lexus IS250

2.5L V6 C F Sport • 16,000 miles

Oceanside ,  CA 92057

$297 - $363

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2014 Lexus IS250

2.5L V6 C • 63,000 miles

Irvine ,  CA 92616

$286 - $350

Last Updated:
Sep 7, 2021 1:30 PM

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What is an Oxygen Sensor?

Would you be shocked if I said it’s a sensor to measure oxygen? Okay, but it’s a bit more than that. Cars have both upstream and downstream sensors (also known as O2 sensors). Upstream oxygen sensors are placed in front of the catalytic converter, and measure the amount of oxygen in the exhaust. The car’s computer then uses that data to determine the proper air to fuel ratio.Downstream oxygen sensors are located behind the catalytic converter, and measure the efficiency of the converter.

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Signs of a faulty Oxygen Sensor

Poor performance

No one likes poor performance. That includes you, and it certainly includes your car. Faulty O2 sensors will feed misinformation to your car’s computer. The computer will then alter the engine in a way that leads to less power, some hesitation and jerkiness, and running rough. Which means you’ll be embarrassed the next time you try to show off at a green light.

Check engine light

Oh, the check engine warning light. That light that you pretend isn’t there when it lights up. How has that worked out for you? Try as you might, ignoring a check engine light won’t make it go away. And oxygen sensor failure is a common cause of the light illuminating.

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How urgent is an Oxygen Sensor replacement?

You’re not really in any danger driving around with a busted O2 sensor. Your car will still be safe to drive. But the performance won’t be ideal, and you may fail an emissions test. You don’t need to drop everything and run straight to a repair, but get around to it when you can.

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Related Lexus IS250 Repairs

Catalytic Converter Replacement EGR Valve Replacement Exhaust Manifold Replacement Exhaust Muffler Replacement Front Oxygen Sensor Replacement Fuel Cap Replacement Fuel Evaporative Canister Replacement Gas Cap Replacement Rear Oxygen Sensor Replacement

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Other Repairs

Coolant Hose Replacement Engine Valves and Cylinder Heads Replacement Crankshaft Sensor Replacement AC Recharge Lower Radiator Hose Replacement Mass Air Flow Sensor Fuel Pump Replacement Engine Valve Adjustment Fuel Evaporative Canister Replacement Left Engine Mount Replacement Right Engine Mount Replacement Coil Spring Replacement Front Hub Assembly Replacement Front Stabilizer Bar Bushing Replacement Rear Stabilizer Bar Link Replacement Rear Strut Mount Replacement Wheel Alignment AC Condenser Replacement

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Lexus o2 sensor

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Lexus IS 250 Oxygen sensor replacement

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