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Fitment notes: Battery located in front trunk (frunk); compact H6 fitment with lower CCA requirement
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Every control module on the 1999-2005 Porsche 911 GT3 (996) — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Digital Motor Electronics / Motronic Engine Control Unit (DME)2.5 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Engine compartment, right rear corner near firewall, below air intake plenum
🔧 Porsche PST2 or PIWIS I
⚠️ Requires immobilizer adaptation and VIN coding. Air intake plenum removal required for access. Component protection requires dealer tool for replacement.
📍 Rear luggage compartment, right side near battery (when equipped)
🔧 Porsche PST2 or PIWIS I
⚠️ Optional equipment on later GT3 models (2004+). Requires calibration after replacement. Not available on all model years.
Anti-lock Brake System Control Unit with Porsche Stability Management (ABS/PSM)1.2 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Front luggage compartment, left side mounted to inner fender
🔧 Porsche PST2 or PIWIS I
⚠️ Integrated ABS and PSM in single unit. Requires brake bleeding and system calibration after replacement.
Climate Control Unit (CCU)1.0 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Center console, behind climate control panel
🔧 Porsche PST2 or Durametric
⚠️ Basic adaptation possible with aftermarket tools. No security protection on this module.
Immobilizer Control Unit (Immobilizer)1.0 hr R&Rdealer / factory tool +1.5 hr▸ programming details
📍 Dashboard area, integrated with ignition lock housing or separate module behind instrument cluster
🔧 Porsche PST2 or PIWIS I
⚠️ Key programming required. Must be matched to DME. All keys must be present for programming. Replacement requires dealer-level security access.
Radio / Audio Head Unit (Radio)0.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Center console, in dashboard center stack
🔧 Self-relearn or Porsche PST2
⚠️ Radio code may be required after battery disconnect. Some units self-adapt. Optional Bose system has separate amplifier.
Seat Memory Control Unit (Seat Memory)0.8 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Under driver seat (when equipped with memory seats)
🔧 Porsche PST2 or Durametric
⚠️ Optional equipment. GT3 typically has fixed-back sport seats without memory. Module only present on comfort seat option.
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 2004 Porsche 911 GT3 (996) 3.6L H6 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.