BMW 335i: Common Problems Encountered by Owners
Part of BMW’s best-selling 3-series lineup, the BMW 335i sedan takes the function and form of a luxury vehicle and takes it up a notch. Unlike its other 3-series counterparts, the 335i features a turbocharged 3.0-liter 300 horsepower engine along with a precision six-speed manual transmission, a tight clutch, and a bleeding-edge suspension and steering system to match. Later models were also remodeled to have a bolder exterior look and a more spacious interior.
There have been several problems that have been encountered by owners on their BMW 335i sedans, with the following being the most common.
The air conditioning systems of 2007-2010 model year 335i sedans have been reported to generate a droning noise. Vibrations from the steering wheel may also be felt once the A/C is turned on. In most cases, the source of the problem is a low refrigerant charge in the A/C.
The 335i sedans released in 2007-2013 have been known to have problematic fuel pump systems, leading to symptoms such as the check engine light illuminating to partial or total loss of power from the high pressure fuel pump. BMW has previously issued a service bulletin regarding this problem, with the suggested repair being the replacement of the fuel pump itself.
The check engine light has also been known to light up due to misfire codes in the powertrain control module DME, with no effect in the performance of the car. This issue is often resolved following an update of the DME software.
BMW has issued a recall regarding the heavy duty cable that connects the vehicle battery to the fuse box. The cable has been reported to wear out at a significant rate, causing higher electrical resistance that could lead to overheating and permanent damage of the cables and even the battery itself. Dealers have been instructed to replace the positive battery cable connector.
Several owners have also encountered problems with the head restraints in the front seat of the 335i, wherein the restraints move down slightly after being adjusted to the fully extended position especially during a sudden stop. This problem is usually fixed by attaching a clamp to the head restraint posts.
When driving my BMW 335i, I experienced stuttering in steep hills and engine power is reduced. The check engine light also comes on. Any idea what's going on?
Check engine light and/or lack of power on your car can be due to a failed high pressure fuel pump. What happens is that the fuel pump is not delivering enough pressure and volume to the engine, which causes the engine to not start properly. The resulting low pressure can cause hard starting, rough idle, misfiring, stalling, and hesitation when you start the engine. On the other hand, if there is no fuel pressure at all, the engine will not start or quit running. Fuel-injected engines are normally very sensitive to fuel pressure and fuel volume. A pump may be able to deliver enough pressure but not enough fuel,causing loss of power. BMW has already issued a service bulletin regarding this problem, and it is suggested to replace a failed high-pressure pump.
I am experiencing a steady vibration in the steering wheel for weeks now and did not realize sooner that it only happens when the air conditioning was on. What is wrong with my BMW 335i?
If you are hearing a droning noise or vibration when driving and experiencing vibration in the steering wheel, try turning your air conditioning system off. If the issues disappear when the AC is not working, the problem could be caused by low refrigerant charge in your car's air conditioning system. Experts remind that if the charge is low, you will need to submit your car to a proper leak diagnosis in addition to recharging the AC system.
Recently, I can smell gas when driving my 335i. I found a leaking fuel at the bottom rear part, near the driver side. What should I do?
If you noticed a gas smell anywhere inside or outside your car, do something about it immediately. It is not normal to smell gas especially when you are driving; it's a clear sign that something is wrong with your engine and that gasoline is leaking. The fuel tank vent hose or the fuel injection line is the place to check first. If you see gasoline leaking in the front area of the car, it means the fuel injector is the culprit. Meanwhile, gas leaks at the back area means the problem is the fuel tank. The gas cap can also be faulty, and you can just replace it for a quick gas-leak fix. Persistent gas leak problems, however, should be better left to your trusted mechanic.
My 335i has 12,000 miles on it and lately, I've been having problems with my ABS module. What could be the problem? Any help would be greatly appreciated.
ABS light turning on, brakes that are not working, and very hard brake pedal—these are just few symptoms that your ABS module needs attention. Your ABS (anti-lock brake system) is a vital car safety component, and you need to make sure it's always working. The most effective solution to this is replacement. But first, confirm that the ABS module is really bad and causing the problem with your brakes. If you notice that the TCS (traction control system) also does not work, wait to change the ABS module first. Sometimes, this could solve both the ABS and TCS problem. It is recommended to have your brakes serviced regularly to clean the sensor of grease and debris as this could damage the ABS control module.