The BMW 120d, a popular choice for those seeking a blend of performance, fuel efficiency, and BMW's signature driving experience, has seen several iterations over the years. Understanding the strengths and weaknesses of different model years is crucial for potential buyers to make an informed decision. This guide will delve into the best and worst years for the 120d, helping you navigate the used car market and find the perfect fit.
BMW 120d Model Years: A Quick Overview
| Model Year Range | Key Features/Changes | Potential Issues/Considerations |
|---|---|---|
| E87 (2004-2011) | First Generation 1 Series; Available as 3-door and 5-door hatchback; Engine: M47 (pre-LCI) and N47 (post-LCI) diesel engines; Rear-wheel drive; Offered a sporty driving experience; Interior quality generally good for its time. | M47 Engine (Pre-LCI): Swirl flap issues, potential for turbo failure. N47 Engine (Post-LCI): Timing chain issues are prevalent, especially in earlier models. Check for engine noise on cold start. Suspension components can wear down with age, requiring replacement. Interior trim can show wear and tear, especially on high-mileage examples. |
| F20/F21 (2011-2019) | Second Generation 1 Series; Available as 3-door (F21) and 5-door (F20) hatchback; Engine: N47 (early models) and B47 (later models) diesel engines; More refined interior compared to the E87; Improved fuel efficiency; Introduction of new technologies and driver assistance systems. | N47 Engine (Early Models): Timing chain issues persist. B47 Engine (Later Models): Generally more reliable than N47, but still requires proper maintenance; Diesel Particulate Filter (DPF) issues can occur if used primarily for short journeys. Electronic components can occasionally malfunction. |
| F40 (2019-Present) | Third Generation 1 Series; 5-door hatchback only; Engine: B47 diesel engine; Front-wheel drive (significant departure from previous generations); More spacious interior and improved practicality; Modern styling and advanced technology features. | B47 Engine: DPF issues can still occur. Early models may have some software glitches that are typically resolved with updates. Front-wheel drive configuration may not appeal to enthusiasts who prefer the rear-wheel drive experience of previous generations. |
Detailed Explanations
E87 (2004-2011): First Generation
The E87 marked the beginning of the 1 Series and offered a unique driving experience thanks to its rear-wheel-drive configuration. This generation was available as both a 3-door and 5-door hatchback. Under the hood, you'll find either the M47 (pre-facelift) or the N47 (post-facelift) diesel engine. While the driving dynamics were praised, reliability concerns, particularly with the engines, are a significant consideration when buying a used E87 120d.
M47 Engine (Pre-LCI): Swirl Flap Issues, Potential for Turbo Failure
The M47 engine, found in pre-facelift E87 models, is known for its swirl flap issues. These flaps, designed to improve low-end torque, can break and be ingested into the engine, causing serious damage. Turbo failure is also a potential problem with this engine, often due to oil starvation or wear and tear. Regular maintenance and preventative measures are crucial if you're considering an E87 with the M47 engine.
N47 Engine (Post-LCI): Timing Chain Issues are Prevalent
The N47 engine, introduced in the post-facelift E87 models, aimed to address some of the M47's shortcomings. However, it became notorious for its timing chain issues. The timing chain, located at the rear of the engine, can stretch and even break, leading to catastrophic engine failure. This issue is more prevalent in earlier N47 models. Listen for a rattling noise, especially on cold start, which could indicate a failing timing chain.
Suspension Components Can Wear Down with Age
Given the age of the E87 models, suspension components like shocks, springs, and control arms are likely to have experienced wear and tear. This can affect the car's handling and ride quality. A thorough inspection of the suspension is recommended before purchasing an E87 120d.
Interior Trim Can Show Wear and Tear
The interior trim of the E87, especially in high-mileage examples, can show signs of wear and tear. Check for cracks, fading, and loose trim pieces, as these can detract from the overall driving experience.
F20/F21 (2011-2019): Second Generation
The F20/F21 generation brought a more refined interior, improved fuel efficiency, and new technologies to the 1 Series. This generation retained the 3-door (F21) and 5-door (F20) hatchback body styles. Early models continued to use the N47 engine, while later models switched to the B47 engine. While the F20/F21 offers a more modern driving experience compared to the E87, reliability concerns still need to be considered.
B47 Engine (Later Models): Generally More Reliable Than N47, But Still Requires Proper Maintenance
The B47 engine was introduced to address the timing chain issues of the N47. While generally more reliable, the B47 is not immune to problems. Proper maintenance, including regular oil changes and servicing, is crucial to ensure its longevity.
Diesel Particulate Filter (DPF) Issues Can Occur If Used Primarily for Short Journeys
The DPF is designed to trap soot particles from the exhaust. However, if the car is primarily used for short journeys, the DPF may not reach the temperature required to regenerate (burn off the accumulated soot). This can lead to a blocked DPF, resulting in reduced performance and potential engine damage. Regular long journeys or forced regeneration cycles can help prevent DPF issues.
Electronic Components Can Occasionally Malfunction
Like many modern cars, the F20/F21 relies heavily on electronic components. These components can occasionally malfunction, leading to issues with features like the infotainment system, sensors, and driver assistance systems.
F40 (2019-Present): Third Generation
The F40 represents a significant departure for the 1 Series, switching to a front-wheel-drive platform. This generation is only available as a 5-door hatchback. While some enthusiasts lamented the loss of rear-wheel drive, the F40 offers a more spacious interior, improved practicality, and modern styling. The B47 diesel engine continues to be used in the 120d variant.
Front-Wheel Drive Configuration May Not Appeal to Enthusiasts
The switch to front-wheel drive has been a controversial topic among BMW enthusiasts. While it improves practicality and fuel efficiency, it sacrifices the rear-wheel-drive driving experience that many BMW fans appreciate.
Early Models May Have Some Software Glitches
As with any new model, early F40s may have experienced some software glitches. These are typically resolved with software updates, so it's important to ensure that the car has the latest software version installed.
Frequently Asked Questions
Which BMW 120d model year is the most reliable?
The F20/F21 with the B47 engine (2015 onwards) is generally considered the most reliable, but it still requires proper maintenance.
Is the timing chain issue a major concern for all N47 engines?
Yes, the timing chain issue is a significant concern for all N47 engines, especially in earlier models. Listen for rattling noises on cold start.
What is the best way to prevent DPF problems?
Regular long journeys or forced regeneration cycles can help prevent DPF problems.
Is the front-wheel-drive F40 a good choice for driving enthusiasts?
The F40's front-wheel-drive configuration may not appeal to enthusiasts who prefer the rear-wheel-drive experience of previous generations.
What should I look for when buying a used BMW 120d?
Check for engine noise, timing chain issues (N47), DPF condition, suspension wear, and electronic malfunctions. Review the service history.
Conclusion
Choosing the best year for a BMW 120d depends on your priorities and budget. The F20/F21 with the B47 engine offers the best balance of reliability and modern features, while the E87 can be a more affordable option if you're willing to address potential issues. Thorough research, inspection, and a test drive are essential to make an informed decision and find the perfect 120d for your needs.