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BMW 740i Fog Light

BMW 740i Fog Light: Typical Problems and What to Do When They Arise

Your BMW 740i is equipped with fog lights to help you see better whenever the weather is too foggy or misty. However, even though these lights are designed to last for a long time, they eventually get damaged because of various factors. Once this happens, they will cause problems that can seriously compromise your safety. Listed below are some of the problems that you may encounter with your 740i fog lights.

Glaring fog lights

If other drivers are frequently honking at you especially if they are driving towards you, then you'd better make sure that your fog lights are aimed properly. Sometimes, due to driving over potholes and minor collisions, these lights come out of alignment. If this is the case, you must aim the lights with the help of a tape measure and a marker. However, before doing this, make sure that your BMW 740i has at least half a tank of gas and is carrying its usual weight.

Flickering fog lights

Due to constant use, the fog lights of your 740i may eventually get damaged. One surefire sign that this is about to happen is when the lights are flickering all the time. To solve this problem, you need to use a voltmeter to check whether the root of the problem is the switch or the wiring. Once you diagnosed the problem, replace the faulty part immediately to avoid causing more damage to the fog lights.

Dim fog lights

Your BMW 740i fog lights will become too dim sooner or later because of every day use. Once this happens, you won't be able to see well if the weather is too harsh, so your safety will be compromised. As a solution, you should replace the fog light bulbs immediately. Fortunately, this is relatively easy and can be done at home especially if you have replacement bulbs on hand. Just make sure that bulbs you have match with your vehicle's make and model.

Hazy fog lights

Another problem that you may encounter with your fog lights is having hazy lenses due to dirt. Luckily, solving this problem is easy, and you don't have to spend a lot to do so. Just prepare denatured alcohol, a putty knife, and car wax. However, be careful when using the alcohol because it can damage your vehicle's paint job.

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  • Tips to Keep Your BMW 740i Fog Light at Its Best 27 February 2013

    Your safety while on the road is very important. Thus, aside from headlights, your BMW 740i is also equipped with fog lights to help you see better. Unfortunately, if not maintained properly, these lights will eventually get damaged and cause problems. To avoid these, follow the simple tips listed below.


    Check the lenses of the fog lights regularly for debris and dirt.


    Sometimes, due to debris or dirt accumulation, the fog lights of your BMW 740i may become hazy. As a result, they will not be seen by other drivers, and you may become a safety hazard. To avoid this, always check your fog light lenses for dirt build up. In case they are very dirty, clean them using denatured alcohol and car wax. However, make sure that you will not spill the alcohol because it can damage painted surfaces.


    Inspect your fog light wiring regularly.


    So that your fog lights will not suffer from overloading or decreased output, always inspect their wiring before taking your vehicle for a drive. If there is something wrong with the wiring, repair it by replacing the faulty wires. However, make sure that the new wires you are going to use are designed for your vehicle's make and model. What's more, don't forget to disconnect the battery to avoid accidents.


    Make sure that your fog light bulbs are working properly.


    Before taking your BMW 740i for a drive, always make sure that its fog light bulbs are working properly to avoid accidents. If they are not, then you'd better replace them immediately with high-quality headlights that do not cause glare. Also, if you are going to do the repair yourself, avoid touching the bulbs because doing so will only damage them.


    Check the aim of your fog lights regularly.


    Fog lights are important car parts because they help keep you safe especially if the weather is too harsh. However, if they are not aimed properly, they will blind other drivers and cause other problems. Thus, always check your fog lights' aim before going out. In case they are not aimed properly, adjust them based on your headlights, and make sure that they are facing forward.