We recently diagnosed a Check Engine Light (CEL) on this beautiful 2002 BMW Z3 M Roadster. The owner came to us with persistent CEL concerns that ended up being a Catalyst fault codes. Despite having replaced multiple sensors previously, the vehicle still struggled with performance issues. Our team performed a deep dive into the BMW’s electronics to find the root cause.

Uncovering Electronic Overvoltage Faults

We began by scanning the vehicle’s on-board computer for fault codes. Interestingly, we found multiple “overvoltage” faults across several systems. These included the ABS module, instrument cluster, and steering angle sensor.

These codes suggest the vehicle may have been jump-started incorrectly at some point. Voltage spikes like these can damage sensitive European electronics. Consequently, these overvoltage issues can lead to “unplausible” data across the entire vehicle network. Additionally, the o2 sensors that were replaced, may have been the incorrect ones. It’s very easy to put the wrong sensor in the wrong plug and bung. Also, universal o2 sensors are not always the best. You have to wiring the correctly and sometime they have issues if they are not perfect. This is why we always use the OES part that is plug and play. 

Detailed Inspection of Oxygen and Air Sensors

Next, we focused on the customer’s specific complaint regarding the for the oxygen (O2) sensors. Our inspection revealed that the sensors currently installed looked old and poorly mounted. For example, the Bank 2 downstream cable was too long and not clipped into its original BMW location.

We also found several critical fault codes related to the engine’s fuel trim controls:

• Oxygen Sensor Pre-Cat (Cyl 4-6): Failed period duration.

• Trim Control Pre-Cat and Post-Cat: Intermittent and history faults.

• Voltage Monitoring: Inconsistent readings from the sensors causing the check engine light.

The Recommended Path to Engine Performance

To restore the Z3 M Roadster check engine light to its factory performance, we recommended a comprehensive sensor refresh. Therefore, we advised replacing all four oxygen sensors—both upstream and downstream—to ensure the ECU receives accurate exhaust data.

Furthermore, we recommended replacing the Exhaust Gas Temperature (EGT) sensor and the Mass Air Flow (MAF) sensor. These components work together to manage the air-fuel mixture. When they age or fail, the engine runs rich or lean, which eventually destroys the expensive catalytic converters.

Renton European Specialists for a Check Engine Light

Classic BMW M-series vehicles require precision parts and expert knowledge. At Meister Werks European, we use high-quality OES and Genuine BMW parts to guarantee a perfect fit. We also provide a 1-year or 12,000-mile warranty on all parts and labor.

Don’t let a fault code ruin your driving experience. Whether you have a Z3 M Roadster or a modern BMW, our technicians can solve your most frustrating electrical issues. Schedule your diagnostic appointment today at our Renton shop by calling (425) 254-0627 or visiting www.rentoncarrepair.com.

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Why is Replacing Brake Rotors with new pads on your European vehicle is necessary? This is because old rotors can have uneven wear, grooves, or be too thin after a full brake pad life, which degrades new pad performance. It is standard practice for German cars like Porsche, VW, Audi, Mercedes-Benz, and BMWs to recommend replacing pads and rotors together as a matching set. This is to ensure optimal braking and prevent issues like noise or shuddering. 

The Reasons Why
Replacing Brake Rotors
is Necessary

• Uneven surface: After a brake pad’s lifespan, the rotor’s surface is no longer flat. New pads require a smooth surface to “bed in” properly.
• Grooves and scoring: Worn pads can create deep grooves on the rotor surface, which will prematurely wear down new pads, cause noise, and reduce braking performance.
• Minimum thickness: Rotors have a minimum thickness specification. If they’ve been worn down below this point, they are unsafe and must be replaced.
• Warping: A vibrating or pulsing brake pedal often indicates that the rotor is warped, which is a condition that cannot be fixed with new pads alone.
• German car specific recommendations: German manufacturers like Audi often recommend replacing rotors with every pad service to ensure consistent, high-performance braking.
• Corrosion: Over time, rotors can develop rust or corrosion, especially on the edges. While resurfacing can remove some surface rust, it can be cheaper and more effective to replace them, particularly if there is significant corrosion. 

What to do?

• Inspect: Meister Werks qualified service technicians will measure your rotors and pads to ensure they are above the minimum thickness. Furthermore, we check for signs of warping, deep grooves, or excessive rust.
• Replace: If the rotors have  wear, grooves, warps, or too thin, they need replacement. After 100% worn pads, the rotors typically need replacement. However, we will let you know the pad and rotor thickness. As a result, it’s highly likely that your vehicle will need new pads and rotors. This is so they operate with proper function and safety.
• Resurfacing is Not a Option: Resurfacing is an option for some vehicles. However, replacing is necessary on all modern European vehicles. This is because resurfacing removes too much material, making them thinner than the worn rotor.  Resurfacing seams like it could be cheaper. However, the additional labor time it takes to resurface. This additional labor costs the same as New Brake Rotors.

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Inspection

While inspecting the AMG we found some damage on the front left bumper. Directly above that was the plastic end cap of the radiator, which was leaking coolant. The customer needed a new radiator, which we were able to procure fairly quickly. We also noticed that the drive belt, idler & tensioner pulleys were in very bad shape. Not good for a drive from the Pacific NW to Utah. Lastly, we suggested replacing the thermostat, since the car had overheated and it may have been comprimized when loosing all the coolant. The customer approved all the repairs except the thermostat, since they said that it was just replaced. Then asked us to order the parts and get started ASAP so they could drive home.

Start The Work

We order the parts and got to the repairs. Once we had all the repairs complete, filled with anti-freesze, and bleed the cooling system – we noticed another leak. It was the plastic return hose fitting on the thermostat. We removed the thermostat and found that the customers mechanic back home had replaced the thermostat with a cheap aftermarket part. Also, they did not replace the return hose, which looked decent with no signs of swelling or damage. Upon further investigation, we found that the hose had broken off inside the thermostat hose adapter. Probably due to slight differences in tolerances between OEM and aftermarket parts.

Critical for Genuine Parts

On critical parts such as this, we always recommend replacing with the Genuine Mercedes-Benz part and with the Genuine hose as well. Even if the hose looks ok, it’s not worth the risk and could have resulted with the car breaking down in this middle of no where between Seattle and Utah.  This could have been much more serious situation.

In conclusion, at Meister Werks always suggest repairing your vehicle the right way and use quality made Genuine OES or OEM parts for your European car.

More Info

For more information on how to get your Mercedes-Benz AMG in the shop for some service, maintenance or custom work, contact us at 425-254-0627. You can also schedule an appointment or receive a quote by clicking here. Meister Werks European & Import is located one block south from The Renton Landing in Renton, WA, across the street from the former Boeing Store and at the westside of the Paccar / Kenworth plant.

Some info about AMG

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We are often asked to address The True Cost of Cheap & ‘Why do we need to replace additional parts’, when repairing our customers European cars. The answer is, due to European vehicles intricate engineering, these vehicles demand specialized care. At Meister Werks, we understand that quick and cheap fixes often lead to long-term headaches. While attempting to save money upfront, the “band-aid” approach to European auto repair can ultimately cost you more and waste your time. More over, it always makes it more difficult, time consuming, and in the end, more costly by not replacing associated parts during a repair. For example, if your car has 80,000 miles and a part breaks, the associated parts that are not broken still have 80,000 miles on them. Consequently, it is highly likely that those parts will fail when installing a brand new part.

The Pitfalls of the True Cost of Cheap aka “Just the Necessary Part”

The allure of a low-cost repair is understandable. However, focusing solely on one failed part ignores the interconnected nature of your vehicle’s systems. When a component fails, it often indicates underlying issues or accelerated wear in related parts.

For example, replacing a worn-out water pump on your European car, without addressing the aging thermostat or radiator hoses, that might seem efficient. However, the new pump places increased stress on these older, weaker components, leading to their premature failure. For example, belts, tensioner assemblies, and idler pulleys. Due to the True Cost of Cheap, you’re back in the shop, facing another repair bill and downtime.

Furthermore, cheap, aftermarket parts often lack the quality and precision of genuine or original equipment supplier (OES) parts. This can result in poor fitment, reduced performance, and a shorter lifespan, ultimately requiring replacement sooner than expected.

The Meister Werks Approach: Comprehensive and Correct

At Meister Werks, we believe in doing the job right the first time. This means:

• Thorough Diagnostics: We don’t just fix the symptom; we identify the root cause. OBDII output tests and guided diagnostics on our factory scan tools will allow us to identify check engine lights and/or poorly running engines.
• Genuine or OES Parts: We use only the highest-quality parts that meet or exceed manufacturer specifications and will never void any warranties.
• Comprehensive Repairs: We address all related components that show signs of wear or potential failure. For example, when replacing a drive belt, we highly suggest replacing the idler and tensioner assemblies while performing this service. About 90% of the time, a new belt will cause pulleys to squeak and fail days or weeks after the replacement.
• Preventative Maintenance: We advise on preventative measures to avoid future issues. Another example, when replacing spark plugs, we highly suggest replacing the ignition coil packs at the same time.

True Cost of Cheap – Why Replacing Related Parts is Essential

Consider a suspension repair. Replacing a worn control arm without addressing the tie rod ends or ball joints is a short-sighted approach. The new control arm will place stress on these aging components, which are likely experiencing similar wear. This leads to premature failure, alignment issues, and compromised handling.

By replacing all related parts simultaneously, we ensure:

• System Harmony: All components work together optimally, extending their lifespan. (Belts, Idlers, and Tensioners)
• Improved Performance: Your car handles and performs as intended. (Shocks, Shock Mounts, & Stabilizers links)
• Long-Term Savings: You avoid repeat repairs and costly breakdowns.
• Peace of Mind: You know your vehicle is safe and reliable.

Investing in Quality, Not Quick Fixes

European cars deserve meticulous care. At Meister Werks, we prioritize quality, precision, and long-term reliability. We understand that a well-maintained vehicle is an investment in your safety, comfort, and driving enjoyment.

In conclusion, don’t let a “cheap” repair become an expensive mistake. Trust Meister Werks to provide the expert care your European car deserves. We do it right, so you can drive with confidence.

Meister Werks Parts Brands

* We also carry Genuine Mini, Volvo, SmartCar, etc., and all OES Manufacturer Brands for all makes and models. 

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HVAC Fan Motor resistors are responsible for controlling the blower motor speed. They do this by varying the voltage supplied to the blower motor. They are prone to shorts, corrosion, and overheating. When the resistor fails, typically, the highest setting is the only option that still functions. 

When replacing your heat, A/C, & ventilation blower fan motor or HVAC van motor, we always replace the resistor. We do this due to the potential that the old resistor may damage the new motor. We also replace the inexpensive relay just to ensure that you HVAC motor will not prematurely fail and that you’ll always have air flow though your HVAC system.

Another reason your fan motor might not be working is the switch on your dash. Although very unlikely, we have seen these fail on some cars. Vehicles with more modern digital temperature controls are a little more complex. These digital controllers are also known to fail, however diagnosing the problem is sometimes a little easier. Using a OBDII factory scan tool, we are able to scan the entire vehicle for fault codes. The HVAC system will typically tell us what to look at, although it never says, “replace this part”. We would have to manually inspect the components related to the fault codes and identity the exact problem.

Sometimes performing a service on your air conditioning system will fix the problem. Systems that have leaks and are low on refrigerant will not function. Other times too much pressure will cause it not to work as well. One thing we see a lot of is people trying to charge their own A/C systems with a over the counter bottle. This is by far the best way to damage your A/C system. We see more damage to A/C systems cause from owners thinking they can fix it with a bottle for $25. In the long run you might pay hundreds, if not thousands of dollars to repair this. Over pressurizing the system will damage sensors, pumps and expansion valves. Bring it to the professional with the correct A/C service machine and avoid costly repairs in the future.

For more information on how to get your European cars HVAC, A/C or Fan motor repaired in Renton, call 425-254-0627. You can also email us by clicking here. Meister Werks European & Import is located one block south from The Renton Landing in Renton, WA, across the street from the former Boeing Store and on the westside of the Paccar / Kenworth plant.

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This is the link for the factory Volkswagen Mk2 Digifiz Manual study guide. Also has the wiring harness diagram and explanation of how the digifiz works. Feel free to post this link. In exchange, all we ask is to leave us a 5 star review on Google, click here.

Manual as of July 1987
PN: 700 2809 04 20 / 700.2809.04.20

• Digifiz Factory Manual – Click Here

• Digifiz Owners Manual Insert – (Deutsche/German) – Click Here

Complete Kit – Everything you need

(For Reference Only – Please do not contact us
about buying this, we no longer have this)

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Last week our tech Jonathan and I were able to repair Craig’s (Rennfilms), 1960 Porsche 356b shifter. When driving this beautiful Porsche, It was difficult to find gears and made very sloppy shifts. This was due to the fact that it was missing the main lower ball pivot. It also had some poorly fabricated sheet metal, installed from the previous owner, which was not helping the situation. We had talked to Craig about this concern the last couple times he was in for service and seat bracket fabrication. We decided now was the time to do this.

Starting the project

First, I found a photo off the internet of the exact part we needed. This is really all we had to go by. Since we only had the shifter itself. The other measurements I had were the spring size and the dimensions for opening of the lower stick. I brought the photo into Adobe Illustrator and resized the photo so the hole size slightly larger that the known lower stick size of 20mm. Based off of that, I extrapolated the degree in which the photo was taken. After that, I calculated the outer ball perimeter, ball height and overall height. 

Next, I opened up Fusion 360 to start drafting our CAD file. Using our notes from the internet JPG image dimensions, I was able to come up with this drawing.

The 3d Printer

Since we print replacement parts with high temp resin, we must calculate the shrink rate. This is typically between 1-3%. Using a little simple math, that number needed to be around 103%. For safe measure, we printed 100% through 104%. Furthermore, there was going to be some margin of error. It takes about and hour to print these, so we wanted every option when we started assembling the shifter.. The 104% part fit best, although the 103% would have worked, we wanted some tolerance.

After the part came out we post processed it in a wash / cure station. Washing it with 99% isopropyl alcohol for 10 minutes and curing it with high intensity UV light for 6 minutes. This will harden the resin and prevent it from failing in the future.

While I was drafting and printing the parts, Jonathan media blasted the shifter housing and put a light coat of satin epoxy paint on it. We would have powder coated this in house, but the customer was picking up the same day. Powder coating will add a few hours to the project. If we need to make any adjustments in the future, we will powder coat it. Disassembly is fairly simple so it shouldn’t take too much addition time.

Assembly

After post processing the parts, Jonathan and I took them to the bench to test the sizes and fitment. You can see from this photo that the fit was spot on at 104%.

From here, we performed a dry fit before lubricating the mechanism. They dry fit felt night and day better, and that was without any grease. We removed the shifter for the last time, greased up all the components and reinstalled the shifter assembly. The feel was 100% OEM and each gear was defined, with no lateral movement while in gear. Reverse felt so much different than before, which might take a little getting use to for the customer. (In a good way)

In Conclusion

Overall we were very pleased with how this shifter turned out. The customer was very pleased with the results. Considering the short wait time to make the part and its functionality, It’s pretty amazing that we can replicate parts like this. 15 years ago, this was mythology.

Since we have six different 3D printers (SDA resin and FDM filament), we have the ability to print polyurethane and other synthetic components. With build plate dimensions from 4-1/2″ x 2-1/2″ x 6″ tall all the way up to 16″ x 16″ x 17″ Tall – The possibilities are almost endless.

Information / Schedule

For more information on how to get your classic European vehicle or Porsche repaired, please call 425-254-0627. You can also email us by clicking here. Meister Werks European & Import is located one block south from The Renton Landing in Renton, WA, across the street from the former Boeing Store and on the westside of the Paccar / Kenworth plant.

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