I think the charges are to high

The $906 seams a bit high but there are quite a few variables which could affect the final cost. There is an updated injector available which costs a bit more than the original type. I would suggest that using the updated injector the replacement cost could be in the $600 - $700 range. That does not include diagnostic time or any other work that may have been done. Please check your invoice carefully to see if any additional work was done to account for the price difference.

Just the Spider itself is about $600. So the majority of the price is just the part.