Common Issues with BMW 520 Models and How to Fix Them

By Brian Wong, Reviewed by: Kurt Niebuhr, Updated on April 25, 2024

1. Introduction

The BMW 520 is a mid-size luxury sedan that has been produced by the German automaker BMW since 1972. Over the years, the BMW 520 has undergone several changes and improvements, making it one of the most popular and iconic models in the BMW lineup.

One of the most notable features of the BMW 520 is its sleek and sophisticated design, which has evolved over the years to keep up with changing trends and technologies. The latest generation of the BMW 520, which was introduced in 2016, features a more angular and aggressive design with sharper lines and a more prominent grille.

Another key feature of the BMW 520 is its powerful and efficient engines, which have been designed to provide a balance of performance and fuel economy. The BMW 520 has been offered with a variety of engine options over the years, including both gasoline and diesel engines, as well as hybrid and electric powertrains.

Despite its many strengths, the BMW 520 has also faced its fair share of issues and challenges over the years. Common issues with the BMW 520 have included engine overheating, electrical problems, transmission failures, and various other mechanical issues. However, BMW has always been committed to addressing these issues and providing solutions to ensure the longevity and reliability of its vehicles.

Overall, the BMW 520 remains a popular and highly respected luxury sedan, known for its impressive performance, innovative features, and unmistakable style. Whether you're looking for a reliable daily driver or a high-performance sports sedan, the BMW 520 is sure to deliver.

2. Issues by Model Year

2.1. BMW 520 (E12, 1972-1981)

The BMW 520 (E12) was the first generation of the BMW 5 Series and was produced from 1972 to 1981. This model set the standard for the 5 Series that followed, with its powerful engines, precise handling, and sophisticated styling. However, it was not without its issues.

For the early models of the BMW 520, one of the most common issues was related to overheating of the engine, which was caused by problems with the cooling system. This often led to engine failure and costly repairs. Another issue that plagued some early models was related to rust, which affected the body and undercarriage of the car.

In later years of the BMW 520 (E12), issues with the fuel system were common, including fuel pump failures and carburetor problems. Transmission issues, such as slipping and difficulty shifting, were also reported by some owners.

Overall, the BMW 520 (E12) was a groundbreaking car that set the standard for the 5 Series to come, but it was not without its flaws. Despite these issues, the BMW 520 (E12) remains a highly sought-after classic car today for its performance, style, and place in automotive history.

2.2. BMW 520i (E28, 1981-1988)

The BMW 520i (E28) was the second generation of the BMW 5 Series, produced from 1981 to 1988. The 520i was a popular model that offered a balance of performance and fuel economy, but it was not without its issues.

In the early years of the BMW 520i (E28), issues with the engine were common, particularly related to the timing belt. If the timing belt failed, it could cause extensive damage to the engine and result in costly repairs. Additionally, some owners reported issues with the fuel system, including fuel pump failures and fuel injector problems.

Transmission issues were also reported by some owners of the BMW 520i (E28), particularly related to the automatic transmission. Transmission slipping, difficulty shifting, and erratic shifting were all reported as common issues.

Another issue that affected some models of the BMW 520i (E28) was related to rust, particularly in the wheel wells and undercarriage. This was a common issue with many cars of this era, but it could be particularly problematic for the BMW 520i due to the high cost of repairs.

Overall, the BMW 520i (E28) was a well-regarded luxury sedan that offered a balance of performance, comfort, and fuel economy, but it was not immune to issues. Despite these challenges, the BMW 520i (E28) remains a sought-after classic car today for its timeless design and innovative features.

2.3. BMW 520i (E34, 1988-1996)

The BMW 520i (E34) was the third generation of the BMW 5 Series, produced from 1988 to 1996. It was a popular model that offered a blend of luxury, performance, and technology. However, it was not immune to issues.

In the early years of the BMW 520i (E34), issues with the engine were common. One of the most common issues was related to the engine oil cooler, which could leak and cause oil to mix with the coolant. This could lead to engine damage and costly repairs. Additionally, some owners reported issues with the fuel system, including fuel pump failures and fuel injector problems.

Transmission issues were also reported by some owners of the BMW 520i (E34), particularly related to the automatic transmission. Transmission slipping, difficulty shifting, and erratic shifting were all reported as common issues.

Another issue that affected some models of the BMW 520i (E34) was related to the suspension. Some owners reported that the suspension bushings would wear out prematurely, resulting in a harsh ride and reduced handling.

Rust was also a common issue for some BMW 520i (E34) models, particularly in the wheel wells and undercarriage. This was a common issue with many cars of this era, but it could be particularly problematic for the BMW 520i due to the high cost of repairs.

Overall, the BMW 520i (E34) was a highly regarded luxury sedan that offered a balance of performance, comfort, and technology, but it was not without its issues. Despite these challenges, the BMW 520i (E34) remains a highly sought-after classic car today for its timeless design and innovative features.

2.4. BMW 520i (E39, 1995-2003)

The BMW 520i (E39) was the fourth generation of the BMW 5 Series, produced from 1995 to 2003. It was a popular model that offered a balance of luxury, performance, and style. However, it was not immune to issues.

One of the most common issues with the BMW 520i (E39) was related to the engine cooling system. Some models had issues with the coolant expansion tank, which could crack and cause a loss of coolant. This could lead to overheating and engine damage if not addressed promptly.

Another common issue with the BMW 520i (E39) was related to the suspension system. Some owners reported issues with the front suspension ball joints, which could wear out prematurely and cause a clunking noise while driving. Additionally, some models had issues with the rear suspension bushings, which could also wear out prematurely and lead to a harsh ride and reduced handling.

Transmission issues were also reported by some owners of the BMW 520i (E39), particularly related to the automatic transmission. Transmission slipping, difficulty shifting, and erratic shifting were all reported as common issues.

Electrical issues were also reported with the BMW 520i (E39), particularly related to the wiring harness. Some models had issues with the wiring harness insulation, which could become brittle and crack over time, resulting in electrical issues.

Finally, rust was also a common issue for some BMW 520i (E39) models, particularly in the rear wheel arches and undercarriage. This was a common issue with many cars of this era, but it could be particularly problematic for the BMW 520i due to the high cost of repairs.

Despite these issues, the BMW 520i (E39) remains a highly regarded luxury sedan with a loyal following. Its timeless design and innovative features have made it a sought-after classic car for many enthusiasts.

2.5. BMW 520i (E60/E61, 2003-2010)

The BMW 520i (E60/E61) was the fifth generation of the BMW 5 Series, produced from 2003 to 2010. It was a highly popular model, offering a perfect balance of performance, luxury, and reliability. However, like any other car, the BMW 520i (E60/E61) had its share of issues.

One of the most common issues with the BMW 520i (E60/E61) was related to the engine, specifically the timing chain. The timing chain could stretch over time, which could lead to a loud rattling noise and even engine failure. This issue could be costly to repair, as the engine often had to be removed from the car to access the timing chain.

Another common issue with the BMW 520i (E60/E61) was related to the fuel system. Some models had issues with the high-pressure fuel pump, which could fail and cause the engine to stall or not start at all. Additionally, some models had issues with the fuel injectors, which could become clogged and lead to reduced performance and fuel economy.

Transmission issues were also reported by some owners of the BMW 520i (E60/E61), particularly related to the automatic transmission. Some models had issues with the transmission fluid cooler, which could fail and cause transmission overheating, leading to transmission failure.

Electrical issues were also reported with the BMW 520i (E60/E61), particularly related to the iDrive system. Some owners reported issues with the iDrive screen freezing or not responding, and some models had issues with the battery drain due to faulty electrical components.

Finally, suspension issues were also reported by some BMW 520i (E60/E61) owners, particularly related to the front suspension. Some models had issues with the front suspension strut mounts, which could wear out prematurely and cause noise and reduced handling.

Despite these issues, the BMW 520i (E60/E61) remains a highly regarded luxury sedan with a loyal following. Its sleek design, advanced technology, and exceptional driving dynamics have made it a favorite among BMW enthusiasts.

2.6. BMW 520i (F10/F11, 2010-2017)

The BMW 520i (F10/F11) was the sixth generation of the BMW 5 Series, produced from 2010 to 2017. It was a highly advanced model, featuring advanced technology, exceptional driving dynamics, and a spacious and luxurious interior. However, like any other car, the BMW 520i (F10/F11) had its share of issues.

One of the most common issues with the BMW 520i (F10/F11) was related to the engine, specifically the timing chain. Some models had issues with the timing chain tensioner, which could fail and cause the timing chain to slip or break. This could lead to engine damage or failure, and could be costly to repair.

Another common issue with the BMW 520i (F10/F11) was related to the fuel system. Some models had issues with the fuel injectors, which could become clogged and lead to reduced performance and fuel economy. Additionally, some models had issues with the fuel pump, which could fail and cause the engine to stall or not start at all.

Transmission issues were also reported by some owners of the BMW 520i (F10/F11), particularly related to the automatic transmission. Some models had issues with the transmission shuddering or slipping, which could be caused by a faulty transmission control module or clutch pack.

Electrical issues were also reported with the BMW 520i (F10/F11), particularly related to the iDrive system. Some owners reported issues with the iDrive screen freezing or not responding, and some models had issues with the battery drain due to faulty electrical components.

Finally, some owners reported issues with the suspension of the BMW 520i (F10/F11), particularly related to the rear suspension. Some models had issues with the rear suspension bushings, which could wear out prematurely and cause noise and reduced handling.

Despite these issues, the BMW 520i (F10/F11) remains a highly regarded luxury sedan with a loyal following. Its advanced technology, exceptional driving dynamics, and spacious and luxurious interior make it a favorite among BMW enthusiasts.

2.7. BMW 520i (G30/G31, 2016-present)

The BMW 520i (G30/G31) was introduced in 2016 and is currently in production. As a relatively new model, there haven't been many widespread issues reported yet. However, some common problems reported by owners include:

1. Engine stalling: Some BMW 520i (G30/G31) owners have reported instances of the engine stalling or shutting off while driving. This could be due to a faulty fuel pump, a failing ignition coil, or a malfunctioning crankshaft position sensor.

2. Electrical issues: Some owners have reported problems with the electrical systems, such as issues with the infotainment system, warning lights randomly turning on/off, or the battery draining quickly. These issues could be due to a faulty battery, a defective alternator, or a problem with the car's software.

3. Suspension issues: A few owners have reported issues with the suspension, including noises from the suspension system, vibrations while driving, and uneven tire wear. These problems could be due to worn-out shock absorbers, damaged suspension components, or problems with the wheel alignment.

4. Transmission issues: A few BMW 520i (G30/G31) owners have reported problems with the transmission, such as rough shifting, slipping gears, or a delayed response. These issues could be due to a low transmission fluid level, a damaged clutch or flywheel, or a faulty transmission control module.

5. Brake problems: Some owners have reported problems with the brake system, including squeaking or grinding noises, reduced braking power, or a soft brake pedal. These issues could be due to worn-out brake pads or rotors, a problem with the brake calipers, or a brake fluid leak.

It's important to note that these issues are not necessarily common across all BMW 520i (G30/G31) models, and some owners may never experience any of these problems. However, if you do encounter any of these issues, it's recommended to take your car to a certified BMW mechanic for a thorough diagnosis and repair. Regular maintenance, such as oil changes, brake pad replacement, and fluid checks, can also help prevent or catch potential problems before they become serious.

3. Issues by Engine Type

3.1. M20 Engine

The BMW 520 has been equipped with several engine types over the years, each with its own unique set of issues. One of the most notable engines used in the 520 is the M20 engine, which was produced from 1976 to 1994. Despite its popularity and reliability, this engine type still experienced some issues.

One of the most common problems with the M20 engine was overheating. This could be caused by a number of factors, including a faulty thermostat, a malfunctioning cooling fan, or a damaged water pump. If left unchecked, overheating could lead to serious engine damage, such as warped cylinder heads or a blown head gasket.

Another issue that plagued the M20 engine was oil leaks. These leaks could occur at several points in the engine, including the valve cover gasket, the oil filter housing, or the front and rear main seals. Not only could oil leaks cause a mess under the hood, but they could also lead to low oil levels and poor engine performance.

In addition, the M20 engine was known for its timing belt problems. If the timing belt wasn't replaced at the recommended intervals, it could stretch or break, causing serious damage to the engine's valves and pistons.

Overall, while the M20 engine was generally reliable, it still had its fair share of issues. Regular maintenance and inspections can help prevent these problems from becoming serious, and prompt repairs can save the engine from costly damage.

3.2. M50 Engine

The BMW 520 with the M50 engine was introduced in 1990 as part of the E34 generation. The M50 engine was available in both the 520i and the 525i models. While the M50 engine was generally considered to be reliable, there were a few issues reported over the years.

One of the most common issues with the M50 engine was related to the engine cooling system. The plastic parts used in the cooling system tended to become brittle over time and crack, leading to coolant leaks. This could cause the engine to overheat and potentially cause serious damage. BMW eventually addressed this issue by redesigning the plastic parts in the cooling system with more durable materials.

Another issue with the M50 engine was related to the timing chain tensioner. Over time, the plastic parts in the tensioner would wear out, causing the timing chain to become loose and potentially jump timing. This could cause significant damage to the engine, and in some cases, result in the engine needing to be replaced. To address this issue, BMW eventually switched to a metal timing chain tensioner in later models.

Finally, some drivers reported issues with the idle control valve on the M50 engine. The idle control valve is responsible for regulating the engine idle speed. Over time, the valve could become clogged with dirt and debris, causing the engine to idle poorly or stall. In some cases, the valve could be cleaned to fix the issue, while in other cases, it needed to be replaced.

Overall, the M50 engine in the BMW 520 was generally considered to be reliable and long-lasting. However, as with any engine, there were a few issues that needed to be addressed over the years. Proper maintenance and regular inspections can help catch any issues before they become serious problems.

3.3. M52 Engine

The BMW 520i with the M52 engine was produced from 1995 to 2003. This engine was a 2.0-liter inline six-cylinder engine with double overhead camshafts (DOHC). Despite being known for its smooth and powerful performance, there were still some issues reported by drivers over the years.

One issue with the M52 engine was related to the cooling system. Some drivers reported that the plastic components used in the cooling system, such as the water pump and expansion tank, tended to crack and leak coolant, causing the engine to overheat. This problem could be prevented by regular maintenance and replacement of these components.

Another issue that some drivers experienced was with the engine's valve cover gasket. The gasket tended to degrade and leak oil, which could result in oil burning and a reduction in engine performance. This issue could also be prevented by replacing the gasket regularly.

Some drivers also reported that the M52 engine was prone to developing timing chain issues, which could result in the engine running poorly or even stalling. Regular maintenance and replacement of the timing chain can help prevent this issue.

Overall, the M52 engine was known for its performance and reliability. However, as with any engine, there were still some issues reported by drivers over the years. By staying on top of regular maintenance and promptly addressing any issues that arise, BMW 520i drivers can continue to enjoy the smooth and powerful performance of the M52 engine.

3.4. N20 Engine

The N20 engine is a four-cylinder turbocharged engine that was used in the BMW 520i (F10/F11) model from 2011 to 2017. While generally considered to be a reliable engine, there are a few issues that have been reported by some drivers.

One issue that has been reported with the N20 engine is a timing chain problem. Some drivers have reported that the timing chain can stretch over time, which can cause it to rattle or even break. If the timing chain breaks, it can cause serious damage to the engine, and in some cases, it may need to be replaced.

Another issue that some drivers have reported with the N20 engine is a problem with the fuel pump. Some drivers have reported that the fuel pump can fail, which can cause the engine to stall or not start at all. If the fuel pump does fail, it will need to be replaced.

Finally, some drivers have reported that the N20 engine can suffer from oil leaks. This can be caused by a number of different factors, such as a faulty valve cover gasket or a damaged oil pan. If an oil leak is not addressed promptly, it can cause serious damage to the engine and may require expensive repairs.

It's important to note that not all drivers will experience these issues with the N20 engine, and many drivers have reported being very satisfied with the performance and reliability of their BMW 520i (F10/F11) models. However, if you are experiencing any of these issues with your N20 engine, it's important to take your car to a qualified mechanic as soon as possible to prevent any further damage from occurring.

3.5. N47 Engine

The BMW 520 with the N47 engine has been known to have some issues over the years. One of the most common problems with this engine is timing chain failure, which can lead to engine damage if not addressed promptly. This issue is often caused by a design flaw in the engine's timing chain tensioner, which can wear out over time and allow the chain to become loose.

Another issue with the N47 engine is related to the diesel particulate filter (DPF). This filter is responsible for trapping harmful emissions from the engine, but it can become clogged over time, leading to reduced performance and increased fuel consumption. In some cases, the DPF may need to be replaced to address this issue.

Owners of BMW 520s with the N47 engine have also reported problems with the turbocharger. These issues can include turbo lag, loss of power, and strange noises coming from the engine. In some cases, the turbo may need to be replaced or repaired to address these issues.

Finally, some owners have reported problems with the fuel injectors on their N47 engines. These issues can include misfires, rough running, and reduced fuel economy. In some cases, the injectors may need to be cleaned or replaced to address these issues.

Overall, the N47 engine in the BMW 520 has had its share of problems over the years. However, many of these issues can be addressed with timely maintenance and repairs. If you are experiencing any of the issues listed above, it is important to have your vehicle inspected by a qualified mechanic to determine the best course of action.

3.6. B47 Engine

The B47 engine is a four-cylinder diesel engine produced by BMW. It was first introduced in 2014 and is currently used in various BMW models including the BMW 520. The B47 engine features a common rail fuel injection system, variable-geometry turbocharger, and an aluminum crankcase. It is known for its efficient fuel consumption and good power output.

However, there have been some reported issues with the B47 engine. One common issue is with the timing chain, which can become stretched over time leading to rattling or knocking noises from the engine. Another issue is with the diesel particulate filter (DPF), which can become clogged and cause reduced engine power and increased emissions. Some drivers have also reported issues with the turbocharger, which can fail prematurely and cause a loss of power.

To address these issues, BMW has issued various technical service bulletins and has also extended warranties on certain models and engines. It is recommended that drivers follow the manufacturer's recommended maintenance schedule and keep up with regular servicing to prevent these issues from occurring.

Overall, the B47 engine is a reliable and efficient option for the BMW 520, but it is important to be aware of these potential issues and take necessary steps to prevent them.

4. Conclusion

I apologize, but you have requested for a conclusion about the BMW 520, and you have also asked me not to write a conclusion. Please clarify if you need me to write a conclusion or if you have a different request.

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