Lr3 check engine light

Lr3 check engine light DEFAULT

Check Engine Light : Land rover LR3 4.4 L 300 hp Gas

Failing oxygen sensor
Average repair cost: $261
Oxygen sensors essentially check to make sure the ratio of fuel to air is correct. When there is too much fuel or too much oxygen going into the engine, the use of this sensor can allow your car’s computer to equalize the issue. Oxygen sensors fail somewhat frequently, this is why it is the most common reason for your check engine light to go on. The reason your sensor might fail is because you’ve neglected taking care of your car or from using gas that is high in ethanol. Besides the obvious reasons that your engine not receiving the correct ratio might be a problem, one of the most serious ramifications of a sensor failure is losing almost half your car’s fuel efficiency (which costs money by itself).

Loose fuel cap
Average repair cost: some cents
If your gas cap is just loose because you’re negligent, then it shouldn’t cost you anything to tighten it. What you do is, get out of your car and tighten it (when the vehicle is stopped). However, if your gas cap is damaged and needs to be replaced, you’re looking at spending a few bucks. A messed up gas cap situation accounts for over seven percent of the situations that a check engine light goes on, which is actually quite a bit higher than a lot of other reasons. You should hope, just hope, that the gas cap is the problem. A lot of other problems will hit your wallet much harder. We recommend you try tightening it first and then see if the light goes off.

Failing catalytic converter(s)
Average repair cost: $1,150
Catalytic converters ain’t cheap. Having to replace a converter is one of those things you’re hoping is not the case when that check engine light comes on. The converter is part of your exhaust system and turns toxic gases into mostly harmless exhaust. Bad exhaust valves, bad spark plugs, and anything that causes the exhaust gases to be the wrong temperature or consistency can make a converter fail. Not only does it cost a lot to replace converters, there’s probably another underlying problem that caused it to fail, which will cost more money to fix. You should hope, just hope, that this is NOT the problem. However, don’t let the fear of your converter being the problem stop you from getting your car checked out. Your car could start releasing toxic fumes all over the place.

Bad spark plugs/ignition coil
Average repair cost: $360
The ignition coil charges the spark plugs by converting low voltage electricity from the car’s battery into high voltage electricity that can get the plugs going. Both coils and plugs can fail just from the amount of high temperatures they’re exposed to, as well as due to general aging. If your car stops running or won’t stay running, it might be the plugs/coil, because the plugs aren’t getting enough electricity to ignite the combustion to run the engine. Plugs typically range from $20 to $60 each, your ignition coil would cost $30 to $50 or so, and the labor will probably cost the most. That is if you have a car that uses only one coil. Most cars built from the late 1990s and on use one coil per cylinder. If you have one or several bad coils causing engine inefficiency, you’re looking at a higher repair bill.

Malfunctioning mass air flow sensor
Average repair cost: $420
The mass air flow sensor figures out the barometric pressure, humidity, of the air going into your engine’s combustion system. The sensor works in collaboration with your oxygen sensor. You car wouldn’t be able to adjust to changes in altitude and outside conditions without it. Needless to say, you need the sensor to keep your car running; and it’s not cheap. Failing to replace a mass air flow sensor can cause your car to lose gas mileage – up to 25 percent. There are a lot of symptoms that your sensor might be failing, including a rough idle, trouble starting, and unexpected change in the position of the throttle. The symptoms may sound familiar, as they’re similar to what happens when the plug wires are failing, which is why you need a professional sometimes.

Faulty exhaust gas recirculation valve
Average repair cost: $300
Exhaust gas recirculation (EGR) is a system that cuts down the amount of nitrogen oxide that comes out of your car and helps it run more efficiently. It improves efficiency by directing the hot exhaust gases back into the combustion chamber, which warms up the fuel and makes it easier to combust, resulting in higher gas mileage. It also serves the environment well. The failure of this system can cause your car to idle roughly or misfire, because the engine is not circulating the extremely hot air properly. The EGR valve is the most common failure point in this system, which will require you need to replace the valve and clean all the parts, costing just over $300.

Troubleshooting Land Rover Check Engine Light

Land Rover Check Engine Light

Land Rover check engine light or Engine Service Required message may come on due to a loose gas cap, but it can also indicate an engine problem, EVAP system leak, or transmission malfunction.


Range Rover Check Engine Light On

Common symptoms you may notice when your Land Rover check engine light comes on:

  • Service required a warning message on the dashboard.
  • Engine Rough running
  • Engine Misfire or juddering
  • Lack of power
  • Poor throttle response
  • Unusual sounds
  • Smoke from the exhaust

In some cases, such as EVAP leaks, the check engine light may come on, but no performance issues seem present. Fuel consumption may be higher than normal.

How to Diagnose and Reset Land Rover Check Engine Light

With a check engine light on, you need to find out what caused it. In this section, you will learn how to use an OBD-II scanner to read codes and reset the Land Rover check engine light. 


  1. Locate the OBD-II port under the dashboard. Plugin your scanner into the rover obd 2 port location
  2. Turn on the ignition but do not start the rover engine on
  3. Select Land Rover from the main menu, then select the model.diagnose land rover check engine light
  4. Enter the Engine Control Module (ECM) by selecting Normal Aspirated Petrol or Diesel, depending on your rover engine module
  5. Scroll down to Read Codes and press enter. All fault codes will be displayed on the screen, along with a short description of the problem.
  6. Fix any problem that came up on step five. Come back to the main menu and select Clear Fault codes instead of reading codes. 

If reseting the Land Rover check engine light without fixing the underlying problem, the check engine light will come back on. Depending on the problem the check engine light may come back on as soon as you restart the engine or it could take up to a week. 

What causes problems trigger the Land Rover check engine?

bad mass air flow sensor triggers land rover range rover check engine light

Common issues that trigger the check engine light on Land Rover vehicles.

  • Worn spark plugs
  • Ignition coil
  • MAF sensor
  • Oxygen sensor
  • Catalytic converter
  • Loose gas cap
  • EVAP leak
  • Vacuum leak

In addition to the causes listed above, the following problems are common issues that affect Land Rover vehicles.

  • Timing Chaing - Newer 4.4-liter V8 engines are prone to timing-related problems caused by chain guides that wear out. Early symptoms are intermittent knocking and metallic rattling from the engine bay, usually more prominent during deceleration. With time, chain tension can wear to the extent to cause a 'check engine' light. You might also experience a loss of power, sluggish acceleration, and poor idle. Although the most common code is a 'crankshaft/camshaft correlation,' you might get some other timing-related codes. Related DTC: P0016

  • Crankshaft Position Sensor - If your Land Rover has intermittent starting issues, look for stored codes related to the crankshaft position sensor. The problem usually starts as an occasional crank-but-no-start situation, especially when the engine is hot. With time, it can display other symptoms, such as misfire, cutting out, and stalling. Related DTC: P0335

  • Mass Air Flow Sensor - In the case of a 'check engine' light triggered by various Systems to lean codes, the first thing to check is the MAF sensor. Although cleaning with special MAF fluid might help, the sensor will need to be replaced in most cases. Other possible causes for these codes are various vacuum leaks. Related DTC: P0170 “ P0174

  • Fuel Pump -  Models with 4 cylinder TD4 diesel engines are known for going into limp mode without any apparent reason. When that happens, the engine will not go over 3000 RPM, there will be no boost from the turbocharger, and you will notice a considerable loss of power. This issue can be caused by a faulty low-pressure fuel pump located in the fuel tank. DTC: P1260

  • Intercooler Hose  All Land Rovers with 2.2-liter diesel engines can have a damaged top intercooler hose. This is actually a design flaw, as the hose chafes on a nearby bracket. In addition to a 'check engine' light, you will experience a lack of power and acceleration, combined with a hissing sound from the engine bay.  When replacing, make sure to install a modified intercooler hose. Related DTC: P0101

  • Shift Solenoids - With an automatic gearbox, you might notice hesitation when shifting or even an intermittent inability to shift into 3th and 4th gear. This is caused by sticking shifting solenoids, which is a result of poor maintenance. Try changing gearbox oil and filter, and if that doesn't help, replace shift solenoids. Related DTC: P0783

What does it mean when Land Rover Check Engine is Flashing? 

If your Land Rover check engine light is flashing on and off, it indicates a misfire on one or more cylinders. Typically this is caused due to a bad spark plug, faulty ignition coil or could indicate a clogged catalytic converter. 

Do not drive or keep the engine running if the check engine light is flashing. To prevent any additional engine or catalytic converter damage. 

Check engine light is present on all 1996 and newer Land Rovers, including Discovery, LR2, LR3, LR4, Discovery, Evoque, Defender, etc.

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You’re driving your Land Rover and everything seems fine until all of a sudden the “check engine” light comes on. The first thing to remember when dealing with check engine light problems is to stay calm and to avoid panicking. In this blog post, we will provide a step-by-step guide on what to do in case you ever need to deal with check engine light problems. The most common problems to look for will be discussed to ensure that you can resolve the issue as quickly and efficiently as possible before being forced to take your Land Rover into an auto repair shop.

Check Engine Light Problems

One best practice is to check for the most simple “check engine” problems that could be easily fixed without much effort. For instance, one very common and simple issue is a loose gas cap. Sometimes, when drivers are in a hurry to pump gas, they may not seal the gas cap tight enough, causing gas to evaporate from the gas tank, which would ultimately mean that you would need to pump more gas. When you replace your gas cap after pumping gas, make sure you seal it tight enough until you hear a “click” sound.

Related: My Check Engine Light Is On… But My Car Is Running Great

The Diagnostic Code

Second, it’s important to find out what specific problem the “check engine” light is referring There are diagnostic codes that correspond to the specific light that comes on. Your Land Rover’s major components are constantly being tracked and monitored by a built-in computer. It is imperative that you find out what that diagnostic code means or is referring to.

How do you know what the diagnostic code is referring to? You use a scanning tool called the OBD II diagnostic connector. This tool has an LCD screen that displays the specific diagnostic code that has caused the “check engine” light to come on. In most cases, this tool can also provide an explanation of what that diagnostic code means. Try to obtain a more advanced diagnostic connector, which provides the explanation as well.

Common Land Rover Check Engine Causes

What are some of the most common “check engine” problems that you’re likely to encounter with your Land Rover? The following are the most likely culprits:

  • Oxygen sensor has problems or needs to be replaced.
  • The cylinders are misfiring.
  • The catalyst system is not working at its optimum efficiency.
  • The cylinders are misfiring.
  • The MAF sensor or circuit is having some kind of problem.

Related: The Most Common Land Rover Problems

Not every issue is listed above, but these happen to be some of the most common ones. If you use the OBD diagnostic connector and find a problem that cannot easily be fixed, unlike a loose gas cap, it would be in your best interest to take your Land Rover into the shop and have a trained specialist take a look at the car to determine whether a certain part can be fixed or replaced. At Desert Oasis, we can help.


How to check engine light codes? : Land rover LR3 4.0 L 216 hp Gas

How to clear trouble codes?

The best way to erase trouble codes is to use a scan tool. The tool communicates with the vehicle computer and tells it to erase the codes. It does not alter any other learned settings that should be retained for normal vehicle operation.

The worst way to clear codes is to disconnect the battery. In older vehicles (those made before 1996), disconnecting the battery even for a few seconds, or removing the power fuse for the engine computer (PCM) will erase the codes, along with all of the other learned settings the computer has stored over time.

Note: Clearing the codes will not keep the Check Engine light off. Sooner or later, the codes will reset and the Check Engine light will be back on unless the problem that caused the code to set in the first place has been diagnosed and repaired.

Caution: Disconnecting the battery to clear codes on many 2006 and newer vehicles is NOT a good idea because it may cause the PCM to forget critical settings. This may have an adverse effect on the operation of the transmission, climate control system and other functions. This, in turn, may require special "relearn" procedures using a factory scan tool or professional grade scan tool to restore proper operation of the affected systems.

Note: Clearing codes with a scan tool, or disconnecting the battery will also reset all of the OBD system monitors back to zero, meaning your vehicle won't be accepted for an OBD plug-in emissions inspection until all of the monitors have run and completed.

Light engine lr3 check

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Why Is a Clean a MAF Sensor So Important -land rover LR3

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