The 2007 BMW 335i, part of the E90 generation, remains a popular choice for enthusiasts seeking a blend of performance and luxury. Known for its potent N54 twin-turbocharged engine, the 335i delivers an exhilarating driving experience. However, like any vehicle, particularly one from its era, there are common maintenance points and potential issues that prospective and current owners should be aware of. This article delves into the typical problems associated with the 2007 BMW 335i, drawing upon real-world experiences to provide a comprehensive overview.
Engine and Turbocharger Systems
Despite concerns about turbocharger reliability in early turbocharged engines, the 2007 BMW 335i surprisingly doesn’t suffer from widespread turbo failures. Reports suggest that the turbos themselves are robust. However, components around the turbo system and engine do require attention:
Injectors: While injector issues are sometimes mentioned for the 335i, they are reportedly less frequent in the 2007 model compared to later 335i variants and even the naturally aspirated 328i models of the same era. Injector replacement can be a significant expense, but it’s not necessarily a guaranteed problem for 2007 335i owners.
High-Pressure Fuel Pump (HPFP): The HPFP was a known point of concern for early N54 engines, and BMW did issue recalls and extended warranties to address this. Many 2007 BMW 335i models will have already had the fuel pump replaced under warranty. It’s advisable to check the vehicle’s history to confirm if this service has been performed. Even with the replacement, it’s a component to monitor as these vehicles age.
Intake Valve Carbon Build-Up: This is a characteristic issue of direct injection engines, including the N54 in the 335i. Over time, carbon deposits accumulate on the intake valves, potentially affecting performance and fuel efficiency. Walnut blasting or similar intake valve cleaning services are typically required around the 60,000-mile mark or later to restore optimal engine performance. This is a preventative maintenance item rather than a failure.
Common E90 Chassis and Component Issues
Beyond the engine, the 2007 BMW 335i, being part of the E90 generation, shares some common issues with the broader E90 platform:
Oil Filter Housing Gasket (OFHG): The oil filter housing gasket is a well-known leak point in many BMW engines of this period. The gasket material degrades over time and heat cycles, leading to oil leaks. Replacing the OFHG is a common maintenance task, often performed preventatively around the 60,000-mile mark.
Valve Cover Gasket: While not as universally problematic as the OFHG, valve cover gasket leaks can also occur on the 2007 335i as the car ages. Inspecting for oil leaks around the valve cover is a good practice.
Water Pump and Thermostat: The electric water pump and thermostat are known failure points in E90 BMWs, including the 335i. These components often fail due to age and mileage. Preventative replacement around 60,000-70,000 miles is often recommended to avoid potential overheating issues.
Belt Tensioners: While not always a failure point, replacing the belt tensioners and belts is a standard part of preventative maintenance, typically recommended around 100,000 miles or as part of a general service interval.
Dynamic Stability Control (DSC) System: Some E90 owners experience issues with the DSC system. The problem is often traced to the Bosch DSC electric motor, where graphite debris can accumulate and cause the brushes to stick. Repair services are available for this specific motor, offering a more cost-effective solution than replacing the entire DSC unit.
Ownership Recommendations
Based on the common issues and owner experiences, here are some recommendations for those considering or currently owning a 2007 BMW 335i:
- Maintenance History is Key: Prioritize vehicles with documented maintenance history, especially regarding the HPFP, water pump, thermostat, and oil leaks (OFHG, valve cover).
- Mileage vs. Maintenance: A higher mileage 2007 335i that has had these common issues addressed might be a more reliable purchase than a low-mileage “garage queen” that still has original, aging components.
- Factor in Preventative Maintenance: Budget for preventative maintenance items like intake valve cleaning, water pump/thermostat replacement, and gasket replacements as the car approaches or exceeds 60,000-70,000 miles.
In conclusion, the 2007 BMW 335i is a rewarding vehicle to own, offering a great driving experience. While it has its share of common maintenance items, understanding these potential issues and prioritizing preventative care can lead to a more enjoyable and reliable ownership experience. Focusing on a well-maintained example and being proactive with servicing is crucial for enjoying the performance and character of the 2007 BMW 335i.
