BSD faults after using aftermarket parts:

This is a issue I see a lot when people are using aftermarket parts to save money. I am not going to preach about having to use OEM parts only. In this post, I would just like to explain why some of these parts will cause faults and how to avoid it. With this knowledge you might even save a few dollars!

Picture from eeuroparts.com

The two most common components I see issues with are: alternators and electric water pumps. BMW uses a single wire bus system called BSD (bit serial data). This is a bus system that the DME (digital motor electronics) uses to communicate with alternator, water pump, IBS (intelligent battery sensor) and oil condition sensor. The DME receives information from all these components and also can send commands to the alternator and water pump. Let’s start first with the alternator: the DME gets information about voltage level and battery charge rate and makes decision on how the alternator operates and charges. By doing it this way the vehicle only charges how much and when needed. This saves engine drag and fuel economy. The same happens with the water pump. The DME makes a calculation on water pump speed according to many engine sensors, temps and modes of operation; such as sport mode engaged or high driving. Again, this is done to save on engine drag and fuel economy.

All these components on the BSD network have a computer processor in them in order to send and receive messages on the BSD network. A lot of the super cheap water pumps and alternators that are out there do not have this processor on them and thus can not communicate on the network. Some can even bring the whole network down and cause some problems…but I will get into that in a minute. The aftermarket parts will work, don’t get me wrong, other wise companies wouldn’t sell them. But they don’t work the same as BMW designed ones. So for instance lets say you replace the alternator with OE rebuilt one from aftermarket reseller. Yes, it will look the same and probably be rebuilt with parts from which ever alternator you have Valeo or Bosch. The OEM regulators have a computer processor. A processor will not be in the rebuilt version in order to offer a much cheaper part to consumers. This after market alternator will still work with your car and it’s quite clever. When the BSD communication fails on the car, the alternator fail safe will charge at 14.5v constantly. The aftermarket alternator will still charge, but will not be able to vary the charge level or recharge well if the battery is depleted (such as cold weather). This same principal is used for the water pump. Keeping it a constant flow rate to keep the engine from overheating.

Here are some issues I have seen from the aftermarket components: when plugged into the BSD network it can actually cause a short circuit in the network and bring the whole network down. The components on the network can no longer function properly when the network is compromised. In this scenario, I have seen a car randomly overheat and some have charge malfunction lights come on even when charging properly. The BSD fault codes will not cause any malfunction lights and can only be read out with BMW specific software. The worse case scenario is when that aftermarket component can cause damage to the DME. This case is very expensive and very rare, but I have seen it happen.

I cannot tell you to not use aftermarket parts, but just use reputable brands. Do your research on that component to make sure it works fully with your car. If something is too good of a deal to be true then there is a reason why.

Alpina B6 lack of power


Recently, I encountered a weird issue with a B6 where it lacked power. If you drive the car around town, typically you won’t feel a lack of power. If you decide to do some spirited driving, around 80 mph, the car will fall flat on it’s face. Lights do not come on or faults stored for the lack of power.

I replaced mass airflow sensors, but they didn’t help the issue. Then I decided to check into the high pressure fuel pump. They all had correct pressure under high load. Next, I investigated the lower pressure fuel pump and it had the correct pressure under high load, (around 5.5bar of pressure). Finally, I checked all coolant pumps since the issue seemed to get worse the hotter the engine or air temperature got. It was discovered that the inter cooler pump was not pumping properly. What was needed was to remove and replaced the pump. Alpina their own proprietary pump. In the end, I replaced the pump and bleed the system. During the test drive, it was concluded that the power was functional.

The Alpina uses a modified N63 engine to create the extra power it is known for. This issue would transfer over to any N63 or S63 since they use the same system setup. Make sure if you’re having a lack of power with no faults or warning lights on that you check into the operation of the inter cooler pump.

Continue reading “Alpina B6 lack of power”

Aftermarket parts and your warranty

This is a common question I get from people that want to modify their BMW. Short answer is it can affect your warranty, but not in the manner you may think.

There are many modifications you can do to your vehicle these days some with physical parts and some with software. Any aftermarket parts does not automatically kill your vehicles warranty as most would believe. Only the parts you changed would be considered not covered under the original BMW warranty. In addition, if that aftermarket part causes damage to any other part on the vehicle, then that will also not be covered under the warranty. For example, if you replace your oil cooler thermostat with a different temp rating one and it gets stuck closed and damages the engine; the engine would not be covered from this. This ,of course, is an extreme example.

The most popular modification to any BMW is tuning the engine for more power. Two main ways I see this done, one is flashing the DME (engine control unit) or using a device called a piggy back. When you flash the DME you are installing a modified engine parameters map. BMW has recently started cracking down on people doing this modification. Every time a BMW technician reads out fault memory with factory equipment a data package of the vehicle called FASTA data is sent to BMW. BMW has a team of people who spend all day going through this data to find cars that have been tuned. Once they find a car that has been tuned they will flag the VIN and stop the DME and power train warranty on the vehicle. This basically means your DME and engine are no longer covered under the OEM warranty for any repairs. The rear differential and transmission repairs needed are up to BMW decide if they will cover under the OEM warranty. This is all done automatically by BMW, the dealer personally has no control over this.
Flashing the DME, in my opinion, is the easiest and best option for tuning a BMW.

A piggy back system modifies signals from the engine to the DME to create more power. A lot of tuners use this system because it is basically electronically untraceable beside the physical components installed on the vehicle. In my opinion, since this system uses a physical component more issues can arise from this type of system. I have first hand seen weird fault codes occur and two complete DME failures from this type of system. In a world where BMW is looking for any modifications on the vehicle this system can be left on the car while sending FASTA data since the DME will never sense the modification.

So if you are planning on modifying your BMW, please be aware of the risks involved with what type of mod you are doing. The easiest ones are exhaust, air box, suspension and wheels. Those modifications normally don’t cause any issues. The engine tuning is by far the most risky to do since BMW is looking for it and safety parameters built into the DME software. Don’t worry much about modifying your BMW since if you’re reading this you have already considered it. In summary, just be aware.

Winter blues

Hello all,

It’s that time of year again, when the leaves start changing and soon…we know the frigid winter will be upon us. With that said, it’s time to put that BMW away for storage, sadly, until next driving season. It makes me question living in the Midwest. Here are some ideas you should implement when you store your vehicle for the winter:

1. Wash the vehicle’s exterior and give it a good coat of wax. Wax is (for those who aren’t familiar) a protective barrier for your paint. Don’t forget to give the leather a nice leather conditioner as to keep the leather from drying out.

2. It is never a bad idea to have a car cover as well, it can be quite helpful.

3. Fill the tank with fresh fuel and add stable to the gas tank. Sta-bil helps the fuels from going bad on you faster.

4. Depending on where you store your vehicle, there are two different options for battery care. The vehicle’s battery needs to be charged while in storage either with a trickle charger in car or out of car with a normal charger. If you do use a battery tender/ trickle charger, make sure it has a smart chip to monitor battery voltage and switch itself off when charged. If not, it could ruin your battery – beware!

5. If the vehicle is stored in a colder climate, you will need to check the coolant freezing point to make sure it will stand up to your average winter temps. If this step is skipped – you will have major repairs in spring. (note wind chill does not affect cars so don’t take that into account)

6.(Optional) Change the vehicles oil before placing it in storage. Why? Dirty oil has a higher acid value and will break down the oils cleaning and protection abilities.

7. (If stored for a year or longer) Leave the vehicle resting on jack stands to prevent flat spotting of the tires. You can also look into tire stands that will prevent flat spotting.

8. You need to take preventative measures to keep unwanted guests out of your vehicle. Cover tail pipes with socks and put moth balls down. Different parts of the country will have different guests.

9. Fill tire above specs. Now, don’t go crazy with this just a little bit, no more than 10 psi over.

Note- You may have heard about putting WD-40 or oil on the rotors to keep them from rusting. I don’t believe this is the best idea. The pads can not get oil on them or it will ruin them.

That was the basics on what you need to know about vehicle storage. Here are some tips about restart in the spring.

1. Remove car cover and check under car. Look under the hood and tail pipes for unwanted guests.

2. Check for any leaks and fluid fill levels. Remember to reinstall the battery if removed (make sure battery is fully charged a full battery will measure 12.6v at 12v your battery is low on charge)

3. Turn to the key to the on position, but DO NOT START. Make sure you hear the fuel pump prime and observe for any fuel leaks. If no leaks are found, turn the key off and then back to on position a couple times to make sure the vehicle’s fuel system in primed.

4. (Optional) You can removed the fuel pump fuse before doing step 3 above and crank the engine over to prime the oil system of the engine …if you are worried about dry starts.

5. Start the vehicle and listen for any weird noises (note the engine will make some extra noise on start up after sitting for months). DO NOT step on the accelerator! Allow the vehicle to warm up to full operating temp. (note do not do this in a inclosed area make sure the garage door is open because of fumes) Look for any leaks, the tail pipe will have a lot of water emitting from them this is normal. While warming up, take some time to adjust tire pressures.

6. Go ahead and drive the car! It may stick little from the brakes, but just give it some gas and it should start moving. Immediate spirited driving is not recommended, because your brakes adjust. Drive moderately and use the brakes the same until they feel normal to you again. Plus side, this will give any time for the flat spots on the tires to go away as well.

After all of your hard work you are ready to be back on the road. Have fun!

The oil leak that keeps leaking

A frustrating problem that has even plagued seasoned BMW technicians. You replace a valve cover gasket for a leak and the vehicle will come back still leaking. Even worse, not the only engine that has this issue. In this post I will focus on the most common engines the N62, N54, N52, N20.

N54 is the one we see the most in terms of having an oil leak from the plastic cover cracking. The best way to tell if your cover is leaking is to look for oil stains in the valley by the injectors and ignition coils. The cover cracks, typically right below the crankcase vent cyclones.

See the oil trace running down the valley a sign of a crack.
You can see a hair line crack

Above, you can see there is a hair line crack in the cover causing this leak. Normally, no fault codes or drivability concerns are found when this occurs. The crack is hard to see, so best way to find any crack is a smoke machine. I understand the average person doesn’t have access to a smoke machine. A good inspection for the oil traces are the next best thing.

The N20, though not as common as the N54, still have a lot of them. Normally, plastic cover cracks in the back rear corner of the cover towards the exhaust manifold. This one is a hair line crack that is extremely hard to find, smoke is still the best option. Watching oil trails is another way to find a leak, but can be difficult and small to follow.

The N52 cover is a different leak most of the time. They can still crack, but most of the time what leaks is the oil separator control valve. Normal signs of this can be oil staining around the valve and in the last two ignition coil valleys. It is normal to find oil leaking from the valvetronic motor seal and eccentric shaft seal. At times, right below the valvetronic motor there will be a large pool of oil from a leaking seal. Those are not a valve cover crack issues, just the aged seals.

Circled is the vent valve that can leak.

The N62 normally doesn’t crack on its own. I find most of the time when the cover is cracked its because someone installed the cover wrong. Don’t get me wrong, those N62 covers are a pain to install and can be easily damaged. The common repair of upper timing cover gasket is usually when we see a return car with oil leaking from the cylinder head cover. This is because it was installed incorrectly and cracked. Normally, you will find the crack towards the bottom of the valve cover close to the exhaust. The cover has 3 guides on them and if not seated correctly against the cylinder head; when you tighten down the cover it will damage and cause the leaks.

The three guides on the bottom of the cover.

Hopefully this points out some common issues, saving you from replacing a gasket and still having an oil leak.

The DIY resource page

As these cars get more advanced, they in turn become more complicated and harder to repair. This on-going post is to help point DIYers to the best tools for their BMW projects.

BMW parts catalog
I prefer using http://www.realoem.com, since it is BMW’s parts catalog online. The site can help with parts numbers and part super sessions.
https://www.realoem.com

BMW repair info and electrical diagrams
This site has all the oem wiring and repair info, just as the BMW techs do.
https://www.newtis.info/tisv2/a/en/

BMW repair shop
Did you just move and are not sure where you need to take your BMW? Start here.
https://www.bimmershops.com/

BMW Paint codes
All paint codes since 1960 to the present
https://paintref.com/cgi-bin/colorcodedisplay.cgi?manuf=BMW&con=m

The Lights Stay On

I have experienced a few models of BMWs where the lights are staying on — even when the car is shut off.

This will, of course, cause a drain and eventually damage the battery. Moving the light switch to the OFF position has no affect. This issue is apparent on multiple BMWs, but the main models it affects is the E65/66, and E60/61.

Normally there are no faults for this issue. I suggest to put the light switch into off and unplug the ride height sensors one at a time until the lights turn off. Whichever one you unplug and the lights turn off that is the one that has shorted and is causing the light module to crash.

Replacing the ride height sensor fixes the issue. Also, be aware that the E61 has air ride and will have 3 ride height sensors. Two on the rear and one on the right front lower control arm. Too many people replace light modules for this issue which is quite expensive in comparison to the cost of the ride height sensor.

Battery Care

Battery issues in BMWs have been a common complaint among many owners. The main issue in the past was a large sleep mode demand on the battery around 40 milli amps. Today’s battery demand in sleep mode is 22 milli amps, plus the amount of time it takes for the vehicle to get to sleep mode has been reduced in comparison to older vehicles.

With such a large demand in sleep mode it took a lot of energy to replace what was lost during sleep mode and when starting the vehicle back up. Let’s go through the different battery types and common issues that cause early battery failure or the dreaded battery charge low message. I will also describe what you can do to get the most life out of your battery.

BMW uses many different types of batteries including lead acid, AGM (absorbent glass mat), and lithium ion. Each of these types of batteries have different pros and cons.

  1. Lead acid batteries

BMW no longer uses lead acid batteries regularly and AGM has become the standard.

-Pros: Lead acid batteries are inexpensive compared to the others. They can withstand harsh environments. They can be 100 recycled if properly done.

-Cons: they are heavy and have a short life span. Also, they self draw higher than the other two types of batteries.

2. AGM (absorbent glass mat batteries)

AGM is the most common battery in BMWs these days. Most of the new BMWs are using two batteries to assist with the electrical demand of the vehicle; especially when MSA (engine start stop system) is in use.

-Pros: longer life span, lighter weight. They also have low self discharge.

-Cons: more expensive and damaged easier when completely discharged.

3. Lithium ion

Lithium ion is the newest type of battery in BMWs. The use of Lithium ion started with the F80 M3.

-Pros: the lithium ion energy density is very high compared to the other batteries. They output of the battery is the same all the way until dead. They have the lowest self discharge rate. They will also hold a charge longer period of time.

-Cons: they are really expensive to replace. The charge rate is very specific, for example; using the wrong charger could damage the battery. The internal cells of the battery need to be monitored for temperature and charge for safety reason. If a lithium ion battery overheats it can ignite and would be very hard to extinguish.

These different batteries are marked on the case for what type they are. Once you determine what type of battery you have, then begin a care plan around the type. I witness my customer’s issues when they experience the battery discharged message in the car. There are multiple reasons this light appears. (For more, see my other post about energy diagnosis for lights turned on)

Below are other reasons why the battery drains:

  1. Short tripping the vehicle

Short tripping the vehicle happens whenever the energy used to start the vehicle doesn’t get replaced. Basically, if you start the car and drive 1 or 2 miles to the grocery store and shut the vehicle off; the amount of energy to start the vehicle never was replaced properly. You can see how these short excursions can add up if this is all the vehicle is used for. Of course, this is magnified in colder weather when its typically harder to charge batteries.

  • 2. Long vehicle immobilization

That is a very German description of letting a car sit too long. I see this often with vehicles that are stored or are rarely driven.

3. Weather

This is the biggest issue that accentuates the other two issues listed above . Where I am, in the midwest, during the Winter months the temps can drop into the negative degrees often. These harsh temperatures makes charging a battery back up much more difficult. If you have a lead acid battery, they can completely freeze and explode under certain conditions. Lithium ion and AGM batteries can’t charge/ discharge properly when super cold or overheated.

You’re probably wondering, what can I do to help keep my battery in the best shape and get the best life out of it?

The first thing to do is analyze how you use the vehicle. Does the vehicle get short tripped a lot? Is the vehicle a secondary vehicle that doesn’t get used much?

If the vehicle is short tripped a lot, you can take a long drive every so often to keep the battery up. The other option is to use a trickle charger. A trickle charger will maintain the battery by using the low and slow method. You will want to use a smart trickle charger that can sense the battery charge level and adjust its charge rate. This is the best method to help keep the battery at full charge. A trickle charger will not recharge a very low/dead battery. BMW actually has a very nice trickle charger kit now (The old brick looking one had major issues). The kit comes with two different hook ups. One is quick clips and a version that can be hard wired. Both of these have quick connectors to connect to the charger. DO NOT connect the trickle charger directly to the battery terminals on modern vehicle because you could damage the IBS (intelligent battery sensor). Instead, put the cables on the jump post under the hood. The BMW trickle charger has two settings: one for AGM and one for Lithium ion. The newer BMWs can have a AGM battery and a smaller Lithium ion battery. When charging a dual battery system, just set the trickle charger to AGM. The lithium ion battery has its own module that regulates voltage coming into the cells and can switch it self off once fully charged.

Another item to check is the age of the battery. BMW will stamp the manufacture date of the battery on the negative post. The top two numbers are the week the battery was produced and the bottom in the year (see picture below). Lead acid will normally last 4 years. AGM will last around 5-7 years. Lithium ion will set a faults when it is at end of life. If you are close to these timelines and trickle charging isn’t helping it may be time to replace the battery. ( If you are replacing a battery please read smart charging post about registering your battery)

Reads 20th week of 2009

BMW batteries are expensive and my hope is with better understanding of proper maintenance, BMW owners can avoid early and costly replacements.

Emoji Weirdness

Today’s cars are more advanced than ever. The problems have also became more advanced and complex. Many of you may have heard the new 2019 vehicles are coming with a new I drive system called, ID7.

With the new system many issues have arose with connected drive/ infotainment system. I recently worked on a new X7, and the owner had issues with Apple CarPlay connecting and disconnecting; or not reconnecting to the vehicle automatically. This only occurred with the spouse’s phone. BMW does have new software out to fix many issues with Apple CarPlay. I programmed the vehicle with latest software and tested it with my iPhone and CarPlay, and it operated properly.

I asked the customer to use their phone and it still wouldn’t connect properly. When given approval to search through the contact list, I found some of the contacts had emojis next to the letter names. This is important because, BMW head units can not interpret those emojis. Once we removed the emojis from the contacts the phone connected and worked perfectly.

I have encountered this on older models with bluetooth connection issues, but this was a first with CarPlay. Be aware there are plenty of kinks with new technology in BMW. More to come!