BMW , 3 Series , E90/E91/E92/E93 Common Issues

Most Common (5-10% failure rate)

1. Faulty Oxygen Sensors (average cost: $200-$500)
2. Ignition Coils failing prematurely (average cost: $300-$600)
3. Transmission solenoid packs failing (average cost: $800-$1,200)
4. Rear Main Seal leaks (average cost: $1,000-$2,000)
5. Brake Master Cylinders cracking or leaking (average cost: $500-$1,000)

Moderately Common (2-5% failure rate)

1. Intake Manifold Gaskets failing (average cost: $800-$1,200)
2. Rear Differential bearing noise and failure (average cost: $1,200-$2,000)
3. Front Axle bearings wearing out prematurely (average cost: $500-$1,000)
4. Engine Timing Chain Tensioner failures (average cost: $600-$1,200)
5. Fuel Injectors failing or clogging (average cost: $300-$800)

Less Common (1-2% failure rate)

1. PCV Valve system clogged or stuck (average cost: $500-$1,000)
2. Coolant Leaks from the engine block or cylinder head (average cost: $800-$2,000)
3. Water Pump failures (average cost: $1,200-$2,500)
4. Engine Oil Seal leaks around the engine mounts (average cost: $800-$1,600)
5. Rear Wheel Bearing noise and failure (average cost: $1,000-$2,000)

Rare (less than 1% failure rate)

1. Air Suspension failures or sagging (average cost: $2,000-$4,000)
2. Power Steering Pump leaks or failure (average cost: $800-$1,600)
3. ABS Module failures or codes (average cost: $500-$1,200)
4. Rear Axle shaft failures (average cost: $1,200-$2,500)
5. Turbocharger issues (average cost: $2,000-$4,000)