Hi i,m about to buy a vn commodore wagon of a private seller as its an ex project he told me that it wont start but he showed me receipts he has for a new motor fitted ,gearbox,diff he has replaced coil pack all new sensors crank sensor harmonic ballancer memcal the only thing he has,nt replaced is the computer ECU so i want to find out how to check if the ECU is faulty please help