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Before removing the ECU, disconnect the battery or pull the "Trionic" fuse
Move the carpeting away.
Unlock ECU harness by pulling the lever and unplug it. Undo a screw
in the lower right corner. The ECU slides down.
ECU (engine control unit) replacement on a 1996 900 turbo. The original
ECU is being replaced with an upgraded unit from Nordic.
- 10 mm socket: bolt under the glovebox;
- Torx T25 screwdriver: glovebox and ECU screws.