N55 Engine Wastegate Rattle

The turbocharger's wastegate actuator can develop wear, leading to a distinct rattling noise, particularly noticeable on cold starts or at low RPMs. This is a known characteristic of the N55 engine. Estimated repair cost: $500 - $1500.

Cooling System Components (Water Pump, Thermostat)

The electric water pump and thermostat housing are known failure points, especially as the vehicle ages and accumulates mileage. Leaks or pump failure can lead to overheating. Estimated repair cost: $600 - $1200.

Oil Leaks (Valve Cover Gasket, Oil Pan Gasket)

Aging rubber gaskets, particularly the valve cover and oil pan gaskets, can degrade and begin to leak oil. This is a common maintenance item for many performance vehicles. Estimated repair cost: $400 - $900.

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2014 BMW 135i Maintenance guide

Name: Maintenance dataset for 2014 BMW 135i
Creator: Carfocal

v1.0Updated Jul 4, 2026Daniel Wilson4 Sources Analyzed

MAINTENANCE SUMMARY

The 2014 BMW 135i, with an 'Excellent' public reliability verdict, requires diligent maintenance. Key concerns include potential issues with the N55 engine's wastegate rattle and fuel injectors, alongside typical premium vehicle wear items.

View Critical Issue: Fuel Injector Failure

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Reliability Score

Est. Annual Maintenance Cost

$1,000 - $1,800

TSBs & Recalls

0 TSBs | 0 Recalls

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Key Takeaways

The 2014 BMW 135i boasts an 'Excellent' public reliability rating with no reported recalls or complaints.
Focus on preventative maintenance for the N55 engine, particularly the cooling system (water pump, thermostat) and fuel injectors.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance