2012 BMW 135i
The 2012 BMW 135i is a compact performance coupe known for its engaging driving dynamics and potent inline-6 engine. This model year came with two engine options: the N55 3.0L turbocharged inline-6 producing 300 horsepower and 300 lb-ft of torque, and the N54 3.0L twin-turbocharged inline-6 producing 320 horsepower and 332 lb-ft of torque, which was a very limited production model. Transmission options include a 6-speed manual and a 7-speed dual-clutch (DCT) automatic. Owners often praise its nimble handling, strong acceleration, and relatively compact size making it fun to drive. Common dislikes include the higher cost of maintenance and repairs compared to non-luxury cars, potential for electrical issues, and the sometimes stiff ride.
Engine
N55 3.0L Turbocharged Inline-6
- VANOS Solenoid Failure
- Description/Symptoms: Engine hesitation, rough idling, and decreased performance. Can trigger a check engine light.
- Solution: Replacement of the faulty VANOS solenoid(s).
- Estimated Cost to Fix: $200 - $400+
- Recalls: None Found
- Oil Filter Housing Gasket Leak
- Description/Symptoms: Oil leak near the oil filter housing, visible oil residue, and potentially a burning smell.
- Solution: Replacement of the oil filter housing gasket.
- Estimated Cost to Fix: $300 - $600+
- Recalls: None Found
- Coolant Leaks (Water Pump, Thermostat Housing)
- Description/Symptoms: Coolant loss, overheating, and visible coolant leaks.
- Solution: Replacement of the water pump (often the electric water pump) or thermostat housing.
- Estimated Cost to Fix: $500 - $1000+ for water pump; $300 - $600+ for thermostat housing.
- Recalls: None Found
- Direct Fuel Injector Failure
- Description/Symptoms: Rough idling, misfires, decreased fuel economy, and a check engine light.
- Solution: Replacement of the faulty fuel injector(s).
- Estimated Cost to Fix: $300 - $500+ per injector.
- Recalls: None Found
N54 3.0L Twin-Turbocharged Inline-6 * Description/Symptoms: Engine hesitation, rough idling, and decreased performance. Can trigger a check engine light. * Solution: Replacement of the faulty VANOS solenoid(s). * Estimated Cost to Fix: $200 - $400+ * Recalls: None Found
- High Pressure Fuel Pump (HPFP) Failure
- Description/Symptoms: Long crank times, stumbling, and sudden loss of power. Often triggers a check engine light.
- Solution: Replacement of the HPFP.
- Estimated Cost to Fix: $800 - $1500+
- Recalls: None Found
- Turbocharger Wastegate Rattle
- Description/Symptoms: Rattling noise from the rear of the engine, especially during acceleration or deceleration.
- Solution: Replacement or repair of the turbochargers (wastegate actuator arm).
- Estimated Cost to Fix: $1000 - $3000+
- Recalls: None Found
- Oil Leaks (Valve Cover Gasket, Oil Pan Gasket)
- Description/Symptoms: Oil leaks near the valve cover or oil pan, visible oil residue, and a burning smell.
- Solution: Replacement of the valve cover gasket or oil pan gasket.
- Estimated Cost to Fix: $300 - $600+ for valve cover gasket; $500 - $1000+ for oil pan gasket.
- Recalls: None Found
Transmission
6-Speed Manual
- Clutch Failure
- Description/Symptoms: Clutch slippage, difficulty shifting, and eventual complete clutch failure.
- Solution: Clutch replacement (pressure plate, disc, and throwout bearing).
- Estimated Cost to Fix: $1000 - $2000+
- Recalls: None Found
7-Speed DCT (Dual Clutch Transmission)
- Mechatronic Unit Failure
- Description/Symptoms: Rough or delayed shifting, transmission error messages, and potential complete transmission failure.
- Solution: Replacement or repair of the mechatronic unit.
- Estimated Cost to Fix: $2000 - $4000+
- Recalls: None Found
- Clutch Pack Wear
- Description/Symptoms: Slipping, especially during gear changes, jerky shifts, and difficulty engaging gears.
- Solution: Clutch pack replacement.
- Estimated Cost to Fix: $2500 - $4500+
- Recalls: None Found
Suspension
- Cracked or Broken Springs
- Description/Symptoms: Uneven stance, clunking noises, and compromised handling.
- Solution: Replacement of the affected spring(s).
- Estimated Cost to Fix: $300 - $600+ per spring.
- Recalls: None Found
- Damaged/Worn Struts and Shocks
- Description/Symptoms: Bouncy ride, excessive body roll, and poor handling.
- Solution: Replacement of struts and/or shocks.
- Estimated Cost to Fix: $400 - $1000+ per axle.
- Recalls: None Found
Electrical
- Battery Drain Issues
- Description/Symptoms: Car battery dies frequently, even after short periods of inactivity.
- Solution: Diagnosis and repair of parasitic drains, replacement of faulty modules or sensors.
- Estimated Cost to Fix: $100 - $500+ depending on the cause.
- Recalls: None Found
- FRM (Footwell Module) Failure
- Description/Symptoms: Loss of function of windows, lights, and central locking.
- Solution: FRM module reprogramming or replacement.
- Estimated Cost to Fix: $300 - $800+
- Recalls: None Found
Exterior
- Door Handle Actuator Failure
- Description/Symptoms: Difficulty opening the doors, failure of the keyless entry system.
- Solution: Replacement of the door handle actuator.
- Estimated Cost to Fix: $300 - $600+ per door.
- Recalls: None Found
Interior
- Sticking Center Console Buttons
- Description/Symptoms: Buttons that are hard to push or stick when pushed.
- Solution: Cleaning or replacement of the affected buttons or console trim.
- Estimated Cost to Fix: $100 - $300+
- Recalls: None Found
- Navigation Screen Failure
- Description/Symptoms: Screen freezes, flickers, or becomes completely blank.
- Solution: Replacement of the navigation screen or head unit.
- Estimated Cost to Fix: $500 - $1500+
- Recalls: None Found
Summary
The 2012 BMW 135i, while a very desirable car, can be prone to a range of issues that can be costly to repair. Engine issues, particularly with the N54 HPFP and turbocharger wastegate rattle, are some of the most severe and expensive. Transmission problems with the DCT can also be very costly. Electrical issues such as battery drains and FRM failures are also common annoyances. While not all cars will experience all of these issues, prospective buyers should be aware of the potential risks and budget accordingly.