The 2011 BMW 335d offers a tempting combination of performance and fuel efficiency. With a 0-60 time of 5.3 seconds and over 35 mpg on the highway, it seems like the perfect daily driver. However, potential buyers often express concerns about the long-term reliability and maintenance costs associated with this diesel BMW. This article explores common issues, potential solutions, and factors to consider when assessing the reliability of a 2011 BMW 335d.
Common 2011 BMW 335d Issues
Two prominent problems plague the 2011 335d:
-
DEF Tank Sensor Failures: The Diesel Exhaust Fluid (DEF) tank sensor is known to malfunction, often requiring replacement of the entire tank. This is a costly repair, estimated around $1,000 for the part alone, plus significant labor costs. Unfortunately, the sensors cannot be replaced individually. The lifespan of these tanks is approximately 50,000 miles, making it a recurring expense.
-
Carbon Buildup: Like many diesel engines, the 335d is susceptible to carbon buildup. This can affect performance and efficiency over time. Regular maintenance and preventative measures can mitigate this issue.
Potential Solutions and Considerations
-
Extended Emissions Warranty: BMW offers a 10-year/120,000-mile emissions warranty on the 335d. This can cover some of the costs associated with emissions-related repairs, including DEF tank issues and NOx sensor replacements. Verifying if a potential purchase is still under warranty is crucial.
-
DEF Delete: Some owners opt for a DEF delete, which involves removing the DEF system entirely. While this might seem like a solution to recurring DEF issues, it’s important to note that this modification is illegal for road use in most jurisdictions. In California, for example, tampering with emissions equipment will result in failing the required smog check.
-
Maintenance and Preventative Care: Diligent maintenance can significantly impact the reliability of a 335d. Regular oil changes, fuel filter replacements, and intake cleaning can help prevent carbon buildup and other potential problems.
Is the 2011 BMW 335d Reliable?
The reliability of a 2011 BMW 335d is a complex question. While the car offers impressive performance and fuel economy, it’s essential to acknowledge the potential for expensive repairs, particularly related to the DEF system. The extended emissions warranty offers some protection, but it’s crucial to factor in potential maintenance costs and the risk of issues arising after the warranty expires. For buyers in California, emissions compliance is critical, making modifications like a DEF delete a non-starter. Ultimately, the decision to purchase a 2011 335d depends on individual risk tolerance, mechanical aptitude, and willingness to invest in maintenance. A thorough pre-purchase inspection by a qualified mechanic specializing in BMW diesel engines is highly recommended.
