The 2014 Mini Cooper S with the N18 2.0L turbo (BMW B48 family) represents the last of the second-generation cars before the 2014.5 refresh brought the B38/B46 engines. While more reliable than earlier supercharged models, these still suffer from timing chain issues, carbon buildup, and the problematic Aisin 6-speed automatic transmission when equipped.
Timing Chain Tensioner & Guide Failure
Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Rattling noise on cold start that disappears after 5-10 seconds, Check engine light with camshaft position sensor codes (P0016, P0017), Metallic chain noise at idle, Catastrophic engine failure if chain jumps timing
Fix: Requires timing chain, tensioner, guides, and often VVT solenoids. Front of engine tear-down, 8-12 hours labor. Many shops recommend doing water pump and thermostat while in there. Engine damage from jumped timing requires rebuild.
Estimated cost: $2,000-3,500
Carbon Buildup on Intake Valves
Common · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: Rough idle and misfires (especially cylinders 2 and 3), Hesitation and stumbling on acceleration, Poor fuel economy, Check engine light with misfire codes P0300-P0304
Fix: Direct-injection engines build carbon since fuel never washes intake valves. Walnut blasting required—intake manifold removal, 4-6 hours labor. Should be done every 50,000-60,000 mi as preventive maintenance.
Estimated cost: $500-800
Aisin 6-Speed Automatic Transmission Failure
Occasional · high severity
Typical onset: 70,000-120,000 mi
Symptoms: Harsh shifts or slipping between 2nd and 3rd gear, Transmission goes into limp mode (stuck in one gear), Clunking during shifts, Transmission fluid overheating (burnt smell), Check engine light with transmission fault codes
Fix: The Aisin 6F35 automatic is notoriously problematic in BMW/Mini applications. Oil cooler lines fail first (causing overheating), but often internal clutch packs and mechatronic unit fail. Transmission replacement or rebuild required, 12-16 hours labor. Many owners upgrade cooler lines preventively.
Estimated cost: $4,500-7,000
Turbocharger Wastegate Rattle & Failure
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Rattling noise from engine bay under light throttle (2,000-3,000 RPM), Loss of boost pressure and reduced power, Check engine light with underboost codes (P0299), Excessive oil consumption if turbo seals fail
Fix: Wastegate actuator arm breaks or rattles loose. Some techs attempt wastegate arm repair/replacement (4-6 hours), but most replace entire turbo assembly. Requires downpipe removal and coolant system work.
Estimated cost: $1,800-3,200
High-Pressure Fuel Pump (HPFP) Failure
Occasional · high severity
Typical onset: 50,000-90,000 mi
Symptoms: Long cranking before start, especially when warm, Rough running and misfires under load, Check engine light with fuel pressure codes (P0087, P228C), Car may not start at all when severely failed
Fix: HPFP driven off camshaft in cylinder head. Early failure often due to fuel contamination or cam lobe wear. Replacement requires removing intake manifold and accessories, 3-4 hours labor. Replace fuel filter simultaneously.
Estimated cost: $1,200-1,800
Engine Mount and Transmission Mount Failure
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: Excessive vibration at idle, especially in Drive, Clunking when shifting from Park to Drive, Jerking sensation during acceleration/deceleration, Visible engine movement when revving
Fix: Right-side engine mount and rear transmission mount are liquid-filled and fail frequently. Relatively straightforward replacement, but requires supporting engine/trans. 2-4 hours total for both mounts.
Estimated cost: $600-1,200
Coolant System Leaks (Thermostat Housing & Water Pump)
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Sweet coolant smell from engine bay, Visible coolant pooling under car (pink/orange fluid), Low coolant warning light, Overheating if leak becomes severe
Fix: Plastic thermostat housing and water pump develop cracks and leaks. Housing is 2-3 hours, water pump adds another 2-4 hours (timing-driven). Smart to do together with timing chain service if mileage aligns.
Estimated cost: $800-1,500
Owner tips
Use Top Tier fuel and add fuel system cleaner every 5,000 mi to slow carbon buildup—consider catch can installation
Change oil every 5,000 mi max with BMW LL-01 approved synthetic; these engines are hard on oil
If buying automatic, verify transmission service history and upgrade cooler lines immediately
Listen for timing chain rattle on cold start during test drive—walk away if present
Budget $1,500-2,000 annually for maintenance beyond basics once past 60,000 mi
Manual transmission models are worth considering for enthusiasts willing to maintain them properly; avoid the automatic unless it has documented fresh transmission work—these are fun but expensive to keep running.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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BMW of North America, LLC (BMW) is recalling certain model year 2014-2015 MINI Cooper Hardtop 2 door vehicles manufactured February 25, 2014, to May 16, 2015, 2014-2015 MINI Cooper S Hardtop 2 door vehicles manufactured March 28, 2014, to May 9, 2015, 2015 MINI Cooper Hardtop 4 door vehicles manufactured October 17, 2014, to June 2, 2015, and 2015 MINI Cooper S Hardtop 4 door vehicles manufactured November 24, 2014, to June 11, 2015. During a service appointment, the affected vehicles received replacement front passenger seat cushions (which contain integral Capacitive Interior Sensing (CIS) functions). The CIS functions may have been incorrectly calibrated, and if so, would cause impaired occupant classification and thus inappropriate air bag activation/deactivation.
Consequence: Inappropriate air bag activation/deactivation can increase the risk of occupant injury in the event of a vehicle crash.
Remedy: MINI will notify owners, and dealers will inspect and, if necessary, replace the front passenger seat cushion, free of charge. The recall began on December 28, 2015. Owners may contact MINI customer service at 1-866-825-1525 .
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE · 15V628000
2015-10-07
BMW of North America, LLC (BMW) is recalling certain model year 2014-2016 MINI Cooper S and MINI Cooper two-door vehicles, 2015-2016 MINI John Cooper Works and MINI Cooper S and MINI Cooper four-door vehicles and 2014-2015 BMW i3 vehicles. Due to a manufacturing error, the passenger frontal air bag may not deploy properly in a low speed crash. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
Consequence: In the event of a vehicle crash, an air bag that does not deploy properly increases the risk of injury to the front seat passenger.
Remedy: MINI and BMW will notify owners, and dealers will replace the passenger frontal air bag module, free of charge. The recall began on November 25, 2015. Owners may contact MINI customer service at 1-866-825-1525 and BMW customer service at 1-800-525-7417.
STRUCTURE:BODY · 15V450000
2015-07-17
BMW of North America, LLC (BMW) is recalling certain model year 2014-2015 MINI Cooper and MINI Cooper S Hardtop 2 Door vehicles and 2015 MINI John Cooper Works Hardtop 2 Door vehicles. The affected vehicles do not meet the side impact performance requirements for the rear seat passengers. As such, these vehicles fail to comply with Federal Motor Vehicle Safety Standard (FMVSS) number 214, "Side Impact Protection."
Consequence: If the side impact performance requirements are not met, rear seat passengers may be at a higher risk of injury during a crash.
Remedy: MINI will notify owners, and dealers will install additional energy absorption material between the rear interior side panels and the exterior vehicle body, free of charge. The recall began on September 4, 2015. Owners may contact MINI customer service at 1-866-825-1525. Note: this recall supersedes 14V-815.
EQUIPMENT:OTHER:LABELS · 15V034000
2015-01-26
BMW of North America, LLC (BMW) is recalling certain model year 2014-2015 MINI Cooper Hardtop two door vehicles manufactured December 1, 2013, to December 14, 2014. The affected vehicles may have been manufactured with an incorrect maximum capacity weight stated on the Tire Information Placard. Thus, these vehicles fail to comply with Federal Motor Vehicle Safety Standard (FMVSS) No. 110, "Tire Selection and Rims and Motor Home/Recreation Vehicle Trailer Load Carrying Capacity Information for Motor Vehicles with a GVWR of 4,536 kilograms (10,000 pounds) or less."
Consequence: The maximum weight listed on the label is incorrect (too low) and therefore does not comply with Federal Regulations.
Remedy: MINI will notify owners, and dealers will replace the incorrect labels with corrected labels, free of charge. Owners were mailed interim notification on March 18, 2015. The recall began on October 15, 2015. Owners may contact MINI customer service at 1-866-825-1525.
POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM) · 14V789000
2014-12-15
BMW of North America, LLC (BMW) is recalling certain model year 2014-2015 MINI Cooper Hardtop 2 Door, and Cooper S Hardtop 2 Door vehicles manufactured January 6, 2014, to October 17, 2014. During service appointments, dealers may have inadvertently reprogrammed the transmission control unit with software that may allow drivers to exit the vehicle when the transmission is not in Park. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 114, "Theft Protection and Rollaway Prevention."
Consequence: If the driver exits the vehicle without the transmission being in Park, the vehicle could roll away as the driver and other occupants exit the vehicle or anytime thereafter. A vehicle rollaway increases the risk of injury to exiting occupants and bystanders.
Remedy: MINI will notify owners, and dealers will reprogram the transmission control module with the correct software, free of charge. The recall February 4, 2015. Owners can contact MINI customer service at 1-866-825-1525.
TIRES:TEMPORARY/EMERGENCY SPARE TIRE · 14V619000
2014-10-03
BMW of North America, LLC (BMW) is recalling certain model year 2014 MINI Cooper Hardtop 2-door vehicles manufactured January 7, 2014, to July 21, 2014. The spare wheel may have been attached under the car with a nut that is not self-locking.
Consequence: Vibrations from driving may cause the nut to loosen, allowing the wheel to separate from the car. If the spare wheel separates from the vehicle, it could become a road hazard and increase the risk of a crash.
Remedy: BMW will notify owners, and dealers will replace the spare wheel securing nut with a self-locking nut, free of charge. The recall began on November 20, 2014. Owners may contact MINI customer service at 1-866-275-6464.
AIR BAGS:FRONTAL · 14V422000
2014-07-14
BMW of North America, LLC (BMW) is recalling a certain model year BMW i3 vehicle manufactured March 31, 2014, and certain 2014 MINI Cooper Hardtop vehicles manufactured February 2, 2014 to May 30, 2014. The affected vehicles may have been manufactured with an air bag inflator that was not assembled correctly. This could cause the air bag to not deploy properly in the event of an accident.
Consequence: If the air bag deploys improperly in the event of a crash necessitating deployment of the air bags, the seat occupant may be at an increased risk of injury.
Remedy: BMW will notify owners, and dealers will replace the front passenger side air bag, free of charge. The recall began in September 2014. Owners may contact BMW customer service at 1-800-525-7417.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.