BMW , 3 Series , G20/G21/G28 Common Issues

  1. Faulty Oxygen Sensor (Lambda Probe) Failure Rate: 12-15%

    • Symptoms: Rough engine idle, decreased fuel efficiency, or illumination of the Check Engine Light.
    • Cost to Repair: $500-$700
  2. Faulty Mass Airflow Sensor (MAF) Failure Rate: 10-12%

    • Symptoms: Similar to those of a faulty oxygen sensor, including rough engine idle and decreased fuel efficiency.
    • Cost to Repair: $300-$500
  3. BMW iDrive System Glitches/Failure Rate: 8-10%

    • Symptoms: Frequent freezing or crashing of the iDrive system, which can be frustrating for drivers who rely heavily on it for navigation and entertainment.
    • Cost to Repair: $1,000-$2,500 (depending on the extent of the repair needed)
  4. Transmission Issues/Failure Rate: 7-9%

    • Symptoms: Delayed shifting, slipping gears, or difficulty shifting into certain gear.
    • Cost to Repair: $1,200-$3,500
  5. Faulty Rear Wheel Bearing Failure Rate: 6-8%

    • Symptoms: Grinding noise from the rear wheels when driving slowly or making turns.
    • Cost to Repair: $800-$1,400 (per side)
  6. Rear Main Seal Leaks/Failure Rate: 5-7%

    • Symptoms: Oil leaks from the rear of the engine, often indicated by a sweet or gasoline smell on warm days.
    • Cost to Repair: $600-$1,200
  7. Faulty Power Window Motors Failure Rate: 4-6%

    • Symptoms: Stuck power windows that either don't go up/down all the way or get stuck in one position.
    • Cost to Repair: $200-$500 (per window)
  8. Sunroof Leaks/Failure Rate: 3-5%

    • Symptoms: Water ingress into the car through the sunroof when it rains.
    • Cost to Repair: $400-$1,000
  9. Faulty Electronic Throttle Control Failure Rate: 2-4%

    • Symptoms: Engine hesitation or stumbling at low RPMs while accelerating.
    • Cost to Repair: $1,200-$3,500 (depending on the extent of the repair needed)
  10. BMW iDrive System Screen Cracks/Failure Rate: 2-3%

    • Symptoms: A cracked screen that displays nothing when turned on or displays distorted images and text.
    • Cost to Repair: $600-$1,200
  11. Faulty High Pressure Fuel Pump Failure Rate: 1-3%

    • Symptoms: Illumination of the Check Engine Light due to high engine oil pressure readings or decreased fuel efficiency.
    • Cost to Repair: $2,000-$4,500 (depending on the extent of the repair needed)
  12. Water Pump Failure Rate: 1-2%

    • Symptoms: Overheating of the engine that may lead to serious damage if not addressed promptly.
    • Cost to Repair: $1,200-$3,500
  13. Faulty Alternator Failure Rate: Less than 1%

    • Symptoms: Illumination of the Check Engine Light or dashboard warning lights for electrical system failure, and sometimes a dead battery when trying to start the car.
    • Cost to Repair: $800-$2,000
  14. Engine Bearing Failure/Failure Rate: Less than 1%

    • Symptoms: Grinding or whining noises from the engine area that can be heard even at low RPMs.
    • Cost to Repair: $3,000-$6,000
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