In this guide, you will certainly learn around the Lexus examine engine light, symptoms, typical problems, and also how to review the password via the OBD-II port. 

If there are engine or emission-related problems, a yellow check engine or "service engine soon" light will illuminate your dashboard.

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In part cases, the message can be due to the cruise control, TRAC Off, or a VSC light, also though there might be no worries with this systems. 

What does Lexus examine Engine light Mean?


Lexus examine engine light method that the On-Board Diagnostic (OBD) system has actually detected a problem.

This can be as simple as a loose gas cap or a much more severe problem like a poor VVT solenoid, spark plugs, catalytic converter, or even transmission issues.

A fault code will be stored in the OBD computer and also easily read with one OBD2 scanner. The error code gives clues as to why her Lexus inspect engine irradiate is on.


Common symptoms the you will an alert when the Lexus check engine light stays on include:

rough idlingpoor accelerationengine no startingengine shakes in ~ idlerough shiftingTRAC OFF, VSC irradiate on

You additionally might an alert that the automobile is misfiring or overheating. However, occasionally there are no symptom at all.

If your Lexus seems to be to run fine, however the inspect engine irradiate still comes on, don"t brush it off. Please make sure you obtain it checked as quickly as possible.

What to carry out when Lexus"s inspect engine light comes on?

When your Lexus check engine light comes on, us recommend checking a few basic items before continuing her journey. Do not continue to drive if the examine engine light is flashing.

Check the gas cap. If the gas cap is loose, tighten it until you hear it click. Once you tighten the gas cap, it have the right to take up to one week for the engine light to reset on its own. Or use an OBD2 scanner come reset that yourself.
Check engine oil level. Turn off the engine. Wait at least 15 min. Open up the hood. Pull out the dipstick and wipe the clean. Reinsert it and remove the to check out the engine oil level. The level should be between the Min and Max marks.
Allow the engine to cool down and check the engine coolant level.
Monitor warning lights and also engine temperature. Do not continue to journey if the examine engine light is flashing, the engine is overheating, or the oil light transforms on.

What problem create Lexus inspect Engine Light?


The most common problems that create the examine engine light on a Lexus space worn spark plugs, bad oxygen sensors, and also a loose gas cap. 

Common reasons for Lexus check engine irradiate to be triggered are:

1. Spark Plugs

A spark plug the no much longer fires is just one of the most typical problems that cause the check engine light on Lexus vehicles.

Many owner don"t realize the spark plugs room wear and tear items and need come be replaced according come the owner"s manual recommendation. Generally 60,000 miles.

On older Lexus vehicles equipped v copper spark plugs, you had to readjust them every 30,000 miles. More recent models space equipped through Platinum or Iridium spark plugs that have the right to last end 100,000 miles.

2. Ignition Coils

Ignition coils space in charge of generating electrical power for the spark plugs. Older Lexuses only have actually one ignition pack, while more recent cars have actually one ignition coil per cylinder.

If other is wrong through the ignition coils, it will certainly certainly create the examine engine light and also codes such together P0300, P0301, P0302, P0303, P0304.

Remember, if you have a diesel Lexus such as LX450 V8 diesel, that doesn"t have ignition coils, so this won"t it is in the problem.

3. VVT device Malfunction

Most Lexus engines have variable entry manifolds, which are a bit much more complicated. This included complexity provides them an ext prone come intake leaks, causing a lean to run engine.

You will certainly usually suffer symptoms together as rough idle, lack of power, or hesitation on accelerations. Such actions can likewise be led to by a dirty MAF sensor, providing false air quantity readings.

If in doubt, clean the MAF sensor, but use just the MAF cleaner liquid for this. Codes: P0171 and also P0174

The variable Valve timing (VVT) sensor varies the oil pressure, which alters the valve lift"s timing. The cams will certainly either advancement or retarded the timing depending on engine speed and also load.

Different determinants could cause the VVT system to malfunction, like a defective Oil manage Valve (OCV) solenoid, dirty or low engine oil, a problem with the valve timing, or a trouble with the VVT controller assembly.

If you have actually VVT problems, you may gain fault password such together P1354, P1349, and P1351. Also, the engine will idle rough and feel underpowered.

Possible solutions will it is in to clean the VVT valves, replace the electronic came sensors, change the OCV solenoid. 

4. Loosened Gas Cap

Another factor the Lexus inspect engine light come on is a loosened gas cap.

The gas cap is a vital part of your car,s fuel distribution system, so if it,s no tightened properly, it can lead to gasoline fuels leaving the tank.If the light transforms on automatically after pour it until it is full up your tank, this is a great place to examine first.

Sometimes it simply needs to be tightened a tiny bit more.

5. Catalytic Converter

One that is specifically common ~ above Lexus vehicles is the converter under-heating. A lot of of civilization who have Lexus vehicles have reported this issue.

They discovered that the converter seemed to be working fine, however the sensor didn"t think that was. So that"s something certain to watch the end for.

Catalytic converters deserve to start come clog up too if the automobile has over 150,000 miles.

6. Oxygen Sensor

If you have a high-mileage Lexus, that is very likely to have actually a examine engine light led to by one emission-control-related issue.

Although save codes will usually allude to a catalytic converter with low efficiency, the is easily possible that you have actually a faulty downstream o2 sensor. Make sure to ascendancy this out before an altering a much much more expensive catalytic converter. Code: P0420 (Catalyst Efficiency listed below Threshold)

Oxygen sensors (O2) may trigger a check engine irradiate to come on. A common fault code triggered by a negative Lexus oxygen sensor is P1150, P1133, P1153 pertained to AF Sensor, which means the circuit because that the heater facet of the O2 sensor is defective.

To deal with this problem, you will have to replace the oxygen sensor. Transforming a Lexus O2 sensor is basic as long as it is just one of the oxygen sensors straightforward to access.

7. Idle air manage valve

Older Lexus cars with a cable-operated throttle deserve to suffer from turbulent idle and also hesitation when increasing from idle.

The trouble usually lies in ~ the idle air control valve, blocked by dirt, oil, or carbon build-up. Usage This carb-cleaner to eliminate the build-up.

Code P0505

8. EVAP System

If friend are obtaining codes related to the EVAP system, an initial check if the hose the connects come the solenoid placed on the engine intake isn"t broken.

Other usual reasons are a bad fuel cap, leaking purge valve, damaged EVAP canister, or cracked lines.

Codes P0441 and also P0445.

9. Camshaft place Sensor

It is not inexplicable for a camshaft place sensor to fail. This generally manifests chin with tough starting, stalling, and consistent or intermittent unstable running.

Luckily, on many models, the camshaft position sensor is fairly easy come replace.

Code: P0340.

10. Oil Sludge

Oil sludging is a serious problem that affects most cars make in the 2000s. This is resulted in by a clogged crankcase ventilation valve, also known as a PCV valve.

This can reason various difficulties ranging indigenous high oil consumption, stormy idle or a check engine light, and even a finish engine failure at highway speeds.

Visible symptoms room blue smoke on startup or acceleration and also yellow gunk ~ above the oil filler cap.

You could also get emission control-related codes, such as P0420.

How come Reset Lexus check Engine Light

This section shows you exactly how to read and also clear Lexus inspect engine error codes (also recognized as Diagnostic trouble Codes or DTC) utilizing an OBD2 scanner. We execute not recommend clearing password without addressing existing problems. 

Locate the OBD2 port under the dashboard—plugin your OBD2 scanner.
Turn ~ above the ignition yet do not begin the engine.
Allow your OBD2 scanner to revolve on and also communicate v your Lexus.
Select Read codes native the key menu.

Fault password will display on the OBD2 scanner, such as P0300, because that example. Write down all the codes and do more research to recognize what they mean and learn about feasible causes.

After the problem has been resolved, you"ll should reset Lexus confirm engine irradiate by going come the clear Codes menu.

Fault codes are just the beginning point.

While they regularly give you great idea the what is wrong, us recommend having a professional auto mechanic correctly diagnose the inspect engine light before replacing any type of parts.

Lexus inspect Engine irradiate Flashing On and also Off


Lexus inspect engine light will start to flash if one or much more cylinders space no longer working properly. This can be led to due to bad spark plugs; a fuel injector is defective, a mass airflow sensor, swollen head gasket, fuel issue, clogged catalytic converter.

Flashing the Lexus check engine light way an engine misfire, i m sorry is a major issue and also needs come be handle immediately.

Please think that the flashing light as a warning authorize that you require to number out the reason immediately and also fix it.

Do not drive her Lexus if the inspect engine light is flashing, or you will cause damage come the engine and catalytic converter.

Check Engine, VSC, Trac off Warning lamp On


Check Engine, VSC, Traction lights stay on after you begin your Lexus; the very first thing you need to do is tighten the gas cap.

A loosened gas lid or a damaged gas lid seal often causes those lamp to which simultaneously.

If tightening or instead of the gas cap does not deal with the problem, use an OBD2 scanner to read the codes.

Should I save driving if my Lexus inspect engine light come on?

As the inspect engine light will not phone call much, deciding on whether you should continue your pilgrimage or not might seem difficult.

Observe how your car behaves, and look because that symptoms such as:

Rough running

Engine misfire or juddering

Lack the power

Poor accelerator response

Unusual sounds

Smoke from the exhaust


Any of this symptoms indicate that the engine in her Lexus is not performing together it should.

Start searching for a safe place to stop, together driving like this could easily reason irreversible engine damage. 

Do no drive the automobile if you an alert performance issues, overheating, or engine shaking.

Driving her Lexus through these systems can cause expensive engine problems.

Frequently asked Questions

How serious is a Lexus check engine light?

Some people may drive miles and also miles with the examine engine light on; however, that"s not a an excellent idea.

Although her Lexus check engine light have the right to be triggered by something as basic as a loosened gas cap, that can also indicate a more dangerous engine problem, emissions, and also even transmission problem.

It"s vital to take the time to find out what"s walk on.

exactly how is the Lexus check engine irradiate diagnosis?

You"ll have to read the codes with an OBD2 scanner or take the auto to a professional, that will hook increase a diagnostic device to review what has actually been detected. The tool will offer a reading of one or several different codes that could be a possible issue.

 How frequently does the inspect engine irradiate come on?

Lexus vehicles room designed to be above average in performance and also durability. However, the doesn"t mean that castle will never have any kind of issues. The inspect engine light can come on at any time, and there is no informing how often it can happen. But if you take it regular care of your car and get regimen checkups, that should help keep your car functioning properly and also reduce the danger of the light being triggered.

 Can ns still drive my car if the check engine light is on? come get

The answer to that inquiry is maybe. The light may be triggered by a faulty sensor, which method nothing is really wrong v your car. Or a bigger, an ext serious problem could trigger it. The trouble is that without a skilled diagnosis, it"s difficult to tell which one that is. To protect your safety and also the safety and security of others on the road, it"s best from acquiring the automobile checked as shortly as feasible and stop driving if the irradiate is on.


The Lexus inspect engine light has a myriad of different causes and meanings. As soon as the CEL come on, Lexus cars and SUVs trigger other warning lamp such as VSC, Traction Control, and also other warning lights. Us recommend addressing the check engine light first, as that will frequently reset the various other warning light.

As with any car, it could indicate a significant problem, or it could just be a faulty sensor. Either way, girlfriend must get your vehicle diagnosed as quickly as possible to see what the problem is.

Hopefully, after reading this article, friend feel much more comfortable knowledge why your examine engine light is on and also what come do around it.

In this guide, friend learned around common problems that cause the Lexus check engine light to come on. Friend will likewise learn just how to review Lexus Diagnostic trouble Codes (DTC) yourself making use of an OBD2 scanner.

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This guide applies to every 1996 and newer Lexus vehicles, including ES, LS, SC, RX models.