Fitment notes: Battery located in engine compartment; European spec vehicle may require vented battery
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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 1986 Porsche 928S 5.0L DOHC 32-valve V8 (288 hp US-spec) and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.