Re: donor Calibra fault code
Did it pop up after you had unplugged a wire from the gearbox, as fault 42 shows up as:
Code42 1 gear ident switch - voltage high C20LET OR EST Line Coil Cylinder 1 & 4 (Voltage High) M2.8 / XEV
Voltage high means there is a plug floating about that's not connected with brown & brown/red wires.
The switch is located at the bottom of the 6 speed gearbox at the FRONT.
If you don't have a switch (ie 5 speed) you will get this fault code. You will also been running low boost, unless you have bleed valved it ?
If you have a 6 speed box, make sure its connected.
Also you need to ensure that the reversing light switch at the top of the gearbox is connected through the ecu loom. Ie astra loom to ecu loom
ecu loom with sleeve to gearbox.
Just give it a quick once over before you do the transplant, we can sort the codes out later (or take the bulb out )