Fitment notes: Mitsubishi Starion platform; compact Japanese battery specification
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Every control module on the 1984-1989 Plymouth Conquest — where it lives, replacement time, and what it takes to program a replacement.
Engine Control Unit (ECU)1.2 hr R&Rno coding
📍 Right side of engine bay, mounted on inner fender near strut tower
⚠️ Mitsubishi-sourced module with burned-in calibration. Replacement requires matching part number for engine/transmission combination. No programming capability—calibration changes require physical PROM chip replacement or complete ECU swap.
📍 Behind instrument panel, accessible after removing cluster bezel and retaining screws
⚠️ Turbocharged models have boost gauge and additional warning lights. Odometer is mechanical; no mileage programming required. Direct plug-and-play replacement.
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 1988 Plymouth Conquest 3.0L V6 Turbo 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.