Hi there I have a 2000 model Astra that snapped the timing belt,
I replaced the x18xe engine with another one, all good bolted engine in done up torque convertor and drove off, drove fine and drove 20 min around and was driving perfect selecting gears, kick down was working everything fine
THEN all of a sudden it just reved when I went to accelerate like it was in neutral. I checked to make sure it was in gear and it was however it won't move it just revs like it is in neutral.

Now I checked for codes and I am only getting P0720-4 output speed sensor circuit malfunction

Anyone help me as I am unsure on what this could be as it looks like everything is working by the solenoid a but won't drive.
I drained and filled transission oil but still nothing. Anyone help me please????
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