The 2012 BMW 3 Series Touring (F31) is part of the sixth generation of the BMW 3 Series lineup and remains a popular choice among luxury car enthusiasts. Offering a perfect blend of performance, practicality, and BMW's hallmark driving dynamics, the F31 is a sporty station wagon that can serve both family and enthusiast needs. The 3 Series Touring is known for its precise handling, refined engine options, and luxurious interior, all while providing the versatility of a wagon. However, like any vehicle, especially one now over a decade old, the F31 has some common issues that potential buyers should be aware of.
In this article, we'll delve into the most common problems that owners of the 2012 BMW 3 Series Touring (F31) face. We’ll also provide guidance on what to look for when buying one and discuss the general costs associated with ownership.
Introduction: The Appeal of the F31 Touring
When BMW introduced the F31 3 Series Touring in 2012, it was designed to offer the handling prowess of the sedan while incorporating the added practicality of a station wagon. Whether you’re after spirited drives on twisty roads or need the cargo space for a family outing, the F31 aims to cater to both.
Engine options include efficient diesel variants like the 320d and performance-oriented choices like the turbocharged inline-six in the 335i. Despite the F31's versatility and luxurious features, as with any BMW, owners and buyers need to be aware of potential problems, especially as the vehicle ages.
Common Problems with the 2012 BMW 3 Series Touring (F31)
1. N47 Diesel Engine Timing Chain Issues
One of the most widely reported problems with the BMW F31, particularly in models with the N47 diesel engine (found in the 318d and 320d variants), is timing chain failure. The timing chain is a critical component, and in this engine, it is known to suffer from premature wear due to poor design and materials.
Symptoms of timing chain failure include:
- Rattling noises from the engine, especially at idle or during cold starts.
- Engine warning lights or fault codes related to timing discrepancies.
- Engine misfires, rough idling, or stalling.
If not addressed in time, a failing timing chain can cause catastrophic engine damage, as it controls the synchronization of the engine's internal components. Replacing the timing chain is a significant repair, often costing thousands of dollars, so it’s important to listen for any abnormal noises and get the chain inspected if you're considering a used model with this engine.
2. Oil Leaks from Valve Cover and Oil Pan Gaskets
Another common issue with the F31, especially in models with the N20 and N55 engines, is oil leaks. The most common sources of these leaks are the valve cover gasket and the oil pan gasket. Over time, the gaskets become brittle and crack, allowing oil to seep out.
Symptoms of oil leaks include:
- Oil spots under the vehicle after it’s been parked for a while.
- A noticeable burning oil smell, especially after driving.
- Low oil levels, requiring frequent top-ups between services.
While oil leaks are not uncommon in older vehicles, it’s important to address them promptly to avoid further damage, such as oil getting onto other engine components or causing oil starvation.
3. Electronic Issues (iDrive and Sensors)
The iDrive infotainment system, which is a central part of the BMW driving experience, can sometimes develop glitches. Problems include:
- Screen freezes or reboots during use.
- Bluetooth connectivity issues with smartphones.
- Parking sensors or reversing camera malfunctioning or displaying errors.
These electronic issues, though not mechanical, can be frustrating and sometimes require software updates or component replacements to resolve. Owners should also be aware of proximity sensor issues, where the car’s sensors fail to detect objects correctly, potentially leading to minor parking mishaps.
4. ZF 8-Speed Automatic Transmission Issues
The F31 is equipped with the ZF 8-speed automatic transmission, which is generally considered one of the best transmissions for smooth shifting and fuel efficiency. However, some owners have reported hard shifting or hesitation during acceleration. These issues are often related to:
- Transmission fluid degradation: Despite BMW’s claim of “lifetime” fluid, it is highly recommended to change the transmission fluid at regular intervals (typically every 60,000 to 80,000 miles) to avoid wear and tear.
- Software issues: Sometimes a transmission reset or software update is needed to recalibrate the shift logic.
While the ZF transmission is known for its durability, ignoring transmission fluid service can lead to expensive repairs or even the need for a full transmission replacement.
5. Suspension Wear (Bushings and Control Arms)
BMWs are known for their superior handling, but this comes at the cost of suspension wear, particularly in older models. The F31, with its sporty suspension setup, often suffers from wear in the bushings, control arms, and anti-roll bar links.
Signs of worn suspension components include:
- Clunking or knocking noises when driving over bumps.
- Uneven tire wear, which may indicate an alignment issue.
- Poor handling or a vague feeling in the steering, particularly at higher speeds.
If suspension components are worn, they should be replaced to maintain the car’s handling and safety. Suspension work on a BMW can be more expensive than on non-premium brands, but it’s essential for preserving the driving dynamics that make the F31 so enjoyable.
6. Carbon Buildup on Intake Valves (Direct Injection Engines)
For F31 models with direct fuel injection, such as the N20 and N55 engines, carbon buildup on the intake valves can become a problem over time. This occurs because, unlike port injection systems, direct injection sprays fuel directly into the combustion chamber, bypassing the intake valves. Without fuel to clean them, carbon deposits accumulate on the valves.
Symptoms of carbon buildup include:
- Rough idling or misfires.
- Decreased throttle response or loss of power.
- Check engine light for misfire codes.
To address this issue, many owners opt for walnut blasting, a procedure that physically removes the carbon deposits from the valves. This is typically recommended after 50,000-70,000 miles.
What to Look for When Buying a 2012 BMW 3 Series Touring (F31)
If you’re considering buying a used F31 Touring, there are several things to look out for to avoid purchasing a car that has been poorly maintained or is prone to expensive repairs:
- Service Records: Ensure the car has a full service history, especially for items like oil changes, timing chain inspections (for diesel models), and transmission fluid changes.
- Timing Chain (Diesel Models): If you’re looking at a diesel variant with the N47 engine, inquire about the timing chain. If it hasn’t been replaced or inspected, budget for this repair.
- Oil Leaks: Check for signs of oil leaks around the engine and under the car. Valve cover and oil pan gasket leaks are common but should be addressed.
- iDrive System: Test the iDrive system thoroughly to ensure it’s functioning correctly. Check for Bluetooth connectivity and test the parking sensors and reversing camera.
- Suspension Condition: Listen for any clunks or knocks during the test drive, particularly over bumps, and check the tire wear patterns.
How Expensive is It to Own a 2012 BMW 3 Series Touring (F31)?
While the F31 offers a premium driving experience, it does come with higher ownership costs compared to non-luxury vehicles. Here are some key factors to consider:
- Fuel Costs: Depending on the engine, fuel costs can vary. Diesel models offer better fuel economy, while petrol variants, especially the more powerful 335i, will consume more fuel.
- Insurance: Insurance premiums for the F31 will generally be higher than for non-premium cars, especially for the sportier trims.
- Maintenance and Repairs: Routine maintenance such as oil changes, brake replacements, and tire rotations will be more expensive than average. Repairs for issues like the timing chain or transmission fluid service can add to the cost, so it’s important to budget for potential repairs.
- Depreciation: While BMWs tend to depreciate quickly in the first few years, the F31 Touring has held its value relatively well in the used car market due to its practicality and desirable driving characteristics.
Conclusion
The 2012 BMW 3 Series Touring (F31) remains a highly desirable car for those looking for a blend of performance, luxury, and practicality. However, like any premium car, it comes with its share of potential problems. Common issues such as timing chain failure in diesel models, oil leaks, suspension wear, and carbon buildup are things that prospective buyers should be aware of.
If you’re considering buying an F31, it’s crucial to ensure the car has been well-maintained, with particular attention paid to the timing chain, transmission fluid changes, and suspension components. With the right care and attention, the F31 can continue to provide the engaging driving experience and versatility that BMW owners have come to expect.