Fitment notes: Battery located in front trunk; European H6 equivalent may also fit
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Every control module on the 1984-1986 Porsche 928S — where it lives, replacement time, and what it takes to program a replacement.
Instrument Cluster (Kombi)2.5 hr R&Rno coding
📍 Dashboard behind instrument panel
⚠️ Analog gauges with electronic speedometer interface. Odometer is mechanical; no mileage programming exists. Replacement requires dashboard removal.
Anti-lock Brake System Control Unit (ABS)2.0 hr R&Rno coding
📍 Front trunk (frunk), passenger side near wheel well
⚠️ Optional equipment. Bosch ABS 2 system. Hydraulic unit and control module integrated; heavy assembly. No coding required but system requires bleeding and functional test.
Bosch Digital Motor Electronics (DME)1.5 hr R&Rno coding
📍 Engine compartment, driver side firewall area near brake booster
⚠️ First-generation Bosch Motronic 2.1 system. Fixed EPROM programming; no field coding capability. Fault codes read via LED flash sequence on DME unit or via Porsche System Tester 1 (PST1) at dealer.
Climate Control Unit (A/C Control)1.5 hr R&Rno coding
📍 Center console, behind climate control panel
⚠️ Electro-mechanical control with vacuum actuators and basic relay logic. No digital programming or diagnostics.
Radio Head Unit (Radio)0.8 hr R&Rno coding
📍 Center console, upper dash area
⚠️ Blaupunkt or Becker unit. May have security code requirement after battery disconnect (owner manual or card). Not a control module in modern sense.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1985 Porsche 928S 4.7L V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.