2009 BMW 335i — Twin-Turbo N54 — Automatic — Transmission Project
Orlando, Florida · 154,874 miles · Automatic
2009 BMW 335i sedan in dark blue with tan interior, automatic transmission, located in Orlando, Florida. Bought an EV, so the BMW has been parked in the garage.
Transmission repair needed
Needs transmission repair. It continues to throw 4F89 — ratio monitoring, gearshift 3–4 — despite replacement of the mechatronics and seals, plus new transmission fluid, pan and filter. The fault remains unresolved.
Maintenance and parts
- Index 11 injectors
- New electric water pump
- New Bosch wideband O2 sensors
- New OEM spark plugs
- New VANOS solenoids
- New metal PCV
- BM intake filters
An N54 twin-turbo inline-six project for someone equipped to diagnose and repair the transmission, replace it, or pursue an enthusiast swap. A ZIP kit, replacement transmission or 8HP conversion are possibilities to investigate; the required fix has not been confirmed.