1991 BMW 535i AutomaticFACTORY OEM SERVICE PROCEDURE

Engine/VIN Id: Identification

MODEL COVERAGE

Model Body Code (1) Engine Engine VIN ID (2) Fuel System (3) Ignition System (4)
318i AJ93 1.8L (M42) 4-Cyl. 3 Bosch Motronic (PFI) DIS
318is AF93 1.8L (M42) 4-Cyl. 3 Bosch Motronic (PFI) DIS
318iC (Conv.) BA73 1.8L (M42) 4-Cyl. 3 Bosch Motronic (PFI) DIS
325i (4-Door) AD13 AD23 (5) 2.5L (M50) 6-Cyl. 3 Bosch Motronic (PFI) DIS
325is AA13 AA23 (5) 2.5L (M50) 6-Cyl. 3 Bosch Motronic (PFI) DIS
325iC (Cabrio) BB13 BB23 (5) 2.5L (M50) 6-Cyl. 3 Bosch Motronic (PFI) DIS
525i HC13 HC23 (5) 2.5L (M50) 6-Cyl. 3 Bosch Motronic (PFI) DIS
535i HD13 HD23 (5) 3.5L (M30) 6-Cyl. 3 Bosch Motronic (PFI) Magnetic
735i GB33 GB43 (5) 3.5L (M30) 6-Cyl. 3 Bosch Motronic (PFI) Magnetic
735iL GB43 3.5L (M30) 6-Cyl. 3 Bosch Motronic (PFI) Magnetic
(1) Body code designated by 4th, 5th, 6th and 7th digit of Vehicle Identification Number (VIN). See VIN DEFINITION.
(2) Engine identified by 7th digit of Vehicle Identification Number.
(3) Airflow meter assembly type system.
(4) With Digital Motor Electronics (DME) engine management system.
(5) Automatic transmission equipped models.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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