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BMW 740i Check Engine Light Flashing

Although there are countless potential causes of an illuminated Check Engine Light, we know from years of providing Check Engine Light Diagnosis Service that there are many common causes including something as simple as a loose gas cap. Other mainly common reasons for a Check Engine Light are damaged oxygen sensor, faulty emissions control part, a malfunction with the fuel injection system, dirty mass airflow sensor, faulty head gasket, or defective spark plugs to name a few. No matter what is the root cause of the Check Engine Light, we have the BMW Certified Technicians and the certified service protocol to isolate the root problem and utterly repair it as necessary to restore factory specifications. When this happens, the Check Engine Light turns off, and you can leave the service center knowing that your BMW issue was completely fixed.

Every BMW 740i was designed with a high-technology performance monitoring system with a computer, and a series of sensors positioned strategically throughout the vehicle on its crucial systems. The rapid sensors are continually detecting conditions while sending crucial data to the electronic control unit. If the electronic control unit detects that the data is out of factory specifications, the Check Engine Light illuminates telling you that there is a problem. Nonetheless, sadly that is the limitation of the Check Engine Light – it won’t tell you what definitely is wrong nor what to do about it. That’s where we come in; Nalley BMW of Decatur provides a Check Engine Light Diagnosis Service that isolates the core problem and gives you a recommendation on what to do next from a Exceedingly Qualified Service professional.

Check Engine Light Service BMW 740i

What do you do when you’re driving along in your BMW 740i and suddenly, a yellow light illuminates on your dash and says "Check Engine". If you’re like most BMW owners, your heart sinks drastically because you may have definitely idea about what that light is trying to tell you or how you should react. The fear of the unknown (or the cost of the unknown) can be just as stressful. But take a deep, peaceful breath and realize the light coming on doesn’t mean you have to pull the vehicle over to the side of the road and call a tow truck, but it is advised that you get your BMW 740i checked quickly. Ignoring that warning could end up causing major, far-reaching damage to expensive engine parts.

When your BMW 740i's ECM (electronic control module), which is the vehicle's onboard computer, finds a problem in the electronic control system that it can’t correct, a computer turns on your check engine light. This amber or yellow light is generally labeled “check engine” or “service engine soon”, or the light may be nothing more than a picture of an engine, or a picture of the engine with the word “check.”

When the light turns on, the ECM stores an engine code or “trouble code” in its memory that can promptly identify the issue, whether it's a sensor or a failing engine part. This code is read with an electronic scan tool that is used by our BMW auto repair mechanics at Nalley BMW of Decatur. There are again a number of relatively inexpensive code readers that are designed for do-it-yourselfers, should you prefer that route too. While this code will tell you the issue that is detected, a true diagnosis still requires an experienced professional to determine the absolutely correct issue and repair it.

What Does the Check Engine Light Mean?

One of the most frequently misunderstood lights or indicators in your BMW 740i is the check engine light. The check engine light is part of the critical onboard diagnostics system, and displays in a wide range of different ways. It can say "Check Engine", it can be a symbol of an engine, it can even be a combination of both. This light illuminates in either an amber or red color and is part of the diagnostics system found on your vehicle. Onboard computers increasingly have controlled and monitored vehicle performance since the 80s and do a wide range of things for your BMW 740i. Some of these essential duties include ignition timing, controlling engine speed, shifting automatic transmissions and implementing security control, just to name a few. With that being said, the check engine light can mean an assortment of different things. It can be as simple as your gas cap being loose or as unpredictable as engine knocking. If your check engine light is on in your BMW 740i, contact Nalley BMW of Decatur. Our BMW service department can help you find out what code is turning your check engine light on or diagnose why your check engine light is flashing. Contact Nalley BMW of Decatur today!

Will the check engine light reset itself?

The check engine light on your BMW 740i will usually shut itself off if the issue or code that caused it to turn on is fixed. For example, if the cause of your check engine light coming on was a loose gas cap, if it's tightened, the light will quickly turn itself off. Again, if your catalytic converter is working perfectly, and you did a lot of stop-and-go driving, that may have turned on the check engine light due to the high usage of the converter. In most cases, your BMW 740i light will go off after about 20-40 miles. If you drive over that amount and the light is still on, you will need to bring it in to Nalley BMW of Decatur so the light and code can be double-checked and reset.

How many miles can you drive with the check engine light?

The safest bet is to decipher the code and then plan your strategy accordingly. It could be anything from a bad sensor to plug wires needing to be replaced. If you check engine light is flashing, we advise that you pull over and contact Nalley BMW of Decatur to help determine if your vehicle is secure to drive in or if we advise a tow truck. Since each check engine code has its own level of severity, it is usually difficult to predict how many miles you can be secure in driving with the warning light on.

BMW 740i Check Engine Light Codes

The check engine light turning on can be quite intimidating, particularly to see that little light on your vehicle’s dashboard suddenly illuminate, but in reality, it is not something that should cause you to shut down in fear right away. If you hear the term, diagnostic trouble codes (DTC), these are just another name for check engine light codes. These are automotive computer codes stored by the ECM, still known as the OBD (on-board computer diagnostic system) in your 740i. There are hundreds of different codes that your check engine light can accurately represent. While that sounds daunting, with a little patience, tackling basic diagnostics will give you advantageous knowledge about your car and will still allow that essential Check Engine Light to do what it is really supposed to do: be your guide. Sadly, apparent and helpful car symptoms do not regularly accompany an illuminated Check Engine Light. Since there are hundreds of imaginable OBD codes, there are still hundreds of imaginable reasons for the light, including:

  • Old Battery
  • Transmission issues
  • Computer output circuit issues
  • Emissions controls issues
  • Fuel and air metering systems problems
  • O2 Sensor
  • Loose Gas Cap or Missing Gas Cap
  • Bad Spark Plugs
  • Ignition system faults

This is why it is crucial for someone who does not have a lot of prevailing automotive knowledge to not assume what a code means. Call Nalley BMW of Decatur at 7706285694 today or schedule your check engine light service online today! If the engine light comes on due to a serious concern, you risk damaging your vehicle further by not repairing the issue right away. When your check engine light comes on, you should get it checked out immediately by a adept certified BMW mechanic.

BMW 740i Check Engine Light

A flashing light signifies that the problem is very serious and if not taken care of quickly may result in major and serious damage to the car. If the check engine light in your BMW 740i starts flashing, that means that the problem needs attention quickly and your BMW should be brought in instantly. This blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system. There it can swiftly raise the temperature of the catalytic converter to a point where damage is likely, requiring an expensive and far-reaching repair. Some owners ask if spark plugs cause the check engine light to flash? This can absolutely be the cause. A broken, old or dirty spark plug can cause the engine to misfire. If your check engine light is invariably flashing, please contact our team of automotive experts at Nalley BMW of Decatur quickly by calling 7706285694. If the problem is completely ignored or you continue to drive, this can spread to the spark plug wires, catalytic converter, or ignition coils which can lead to a immensely costly repair.

Is it safe to drive your BMW 740i with the check engine light on?

This question is not exceptionally simple because it all depends on the severity of the issue. If the cause is a minor issue, such as a loose gas cap, it should be safe to drive. This is ordinarily indicated by a steady glow of the check engine light. If you notice a difference in the performance of the vehicle, it could be an indication of a more serious problem. If the check engine light is flashing, this means that there is a serious issue and it is recommended to service your BMW 740i quickly. Call the experts at Nalley BMW of Decatur by dialing 7706285694 so you can describe the issues. Or decrease your speed and bring your BMW to our certified mechanics as in the near future as imaginable.

How much does it cost to get the engine light checked?

The check engine light warns of issues ranging from a gas cap that's not properly tightened to a more serious failure like a bad catalytic converter or a problem with one of the car's oxygen sensors, so it good to get the proper code reading and diagnosis. The average cost for a check engine light diagnosis & testing is usually between $88 and $111. The good news, Nalley BMW of Decatur offers completely free multi-point inspections and free diagnostics, in most cases, to help determine the cause of your check engine light.

What could cause the check engine light to come on in a BMW 740i?

When your check engine light comes on, this could be as simple as tightening or replacing your gas cap. Likewise, the check engine light could again be a warning of a serious problem that could cause serious damage to your engine and come with a hefty and pricey repair bill. Depending on your make and model, the check engine light will illuminate or blink. A steady and continuous glow typically means something less serious but a flashing check engine light signifies that your vehicle’s engine is in serious trouble and useful service is required swiftly. If your check engine light is flashing in your BMW 740i, we immensely endorse not to drive the car and schedule BMW service today. Below is a list of the most common reasons your check engine light can come on:

  • Your O2 Sensor (Oxygen Sensor) needs to be replaced. The Oxygen sensor, known as the O2 sensor, measures the amount of oxygen in your exhaust system. If there is excess oxygen in your exhaust system, fuel burns more rapidly and your vehicle will be less efficient when it comes to fuel economy. So what happens if I don’t replace your O2 sensor? A broken sensor can not only affect your miles per gallon, but it can cause serious damage to your catalytic converter and your BMW 740i's spark plugs. The O2 sensor sends data to the vehicle’s onboard computer to determine the definitely correct mixture of air and fuel that enters the cylinders in your engine. A broken O2 sensor can still cause a car to fail an emissions test.
  • Issues with any aftermarket items. An aftermarket alarm, exhaust or other item can wreak extreme havoc on your BMW 740i if it’s not installed correctly. These aftermarket parts and accessories can drain the battery, trigger the check engine light, or even prevent the vehicle from starting. If these issues sound familiar, bring your 740i to BMW and have our team of accomplished certified mechanics guarantee that your aftermarket items were installed correctly and aren't causing any issue. Getting accessories, particularly aftermarket parts and accessories, or utilizing OEM parts first place might cost a little bit more but could help you save considerably from having to get poor work and damage caused by poor installation work corrected.
  • Your catalytic converter is bad or going bad. The catalytic converter is a part of your BMW 740i’s exhaust system. The catalytic converter's function is to turn the carbon monoxide created by the combustion process into carbon dioxide. A damaged catalytic converter is frequently caused by regularly neglected maintenance, which is why Nalley BMW of Decatur offers a complimentary multi-point inspection with each BMW service. If you have an issue with your catalytic converter and don't get it repaired, your BMW 740i will not pass an emissions test, show a lack of engine performance and will negatively affect your fuel economy. Your car may run at a higher temperature, too, which can cause other perilous problems from overheating.
  • The battery is low or dead. The battery in your BMW 740i is each essential. Without a car battery, your car won’t start, light up the road in front, play the radio or charge your phone. Today’s car batteries last much longer than they did a few decades ago, and they don't really require maintenance. The price of a new one depends on the type of BMW you drive, but check our current service coupons and specials.
  • Your mass airflow sensor (known as MAF) needs to be replaced. The mass airflow sensor in your BMW 740i is what determines how much fuel is necessary to run your engine efficiently by measuring the amount of air entering the engine. As a part of the engine management system, the mass airflow sensor helps adjust to certain changes, like altitude. If your BMW 740i is having trouble starting, idling rough or has a sudden rapid change in the position of the throttle pedal, this could be a crucial sign of a broken mass airflow sensor.
  • One of the most common and frequent cause is that your BMW 740i gas cap is loose, damaged or missing. The gas cap for your BMW 740i serves multiple purposes. It prevents hazardous gas fumes from being released when you aren't driving, it seals the fuel system and helps maintain pressure within the fuel tank. What happens if you have a broken fuel cap? If your gas cap is old or has a ruptured seal, you can lose fuel through evaporation which will result in more trips to the pump and be more costly. Luckily, to replace a gas cap isn't expensive. If your check engine light turns on instantly after you put gas in your BMW 740i, first thing you should check is to make sure the cap isn’t loose — or that it's still on your car’s roof or at the fuel pump.
  • Your BMW 740i has a vacuum leak. Each BMW 740i has a vacuum system that performs a wide variety of functions. The vacuum system still helps lower harmful emissions by routing the fumes as gasoline evaporates through the engine. If you notice that your RPM is high in idle or randomly surges, a vacuum leak could be the cause. Over time, vacuum hoses can dry out and crack, particularly if they’re exposed to intense heat or extreme cold.
  • New Spark Plugs or Plug Wires are necessary for your BMW 740i. The spark plugs are the part of your engine that ignites the air/fuel mixture in the combustion chamber of your vehicle. This explosion is what moves the pistons and makes the engine run smooth. The spark plug wires deliver the spark from the ignition coil to the spark plugs. If your spark plugs or spark plug wires are bad or old, you will experience a evident poor performance and decreased power. In some extreme cases, your engine will have trouble starting or continuing to run. Worn spark plugs and plug wires can cause clogged catalytic converter or damage to ignition coils and O2 sensors, leading to more expensive repairs.