Diagnostic tool

Hi everyone,

I have just swapped my old engine out with my gearbox and replaced it with a new one. Trying to start her back up and all she is doing is making a clicking noise coming from the engine. Not even trying to start. Do I need to reset the engine with a diagnostic tool? If so, what would be a good suggestion to buy? Price is not an issue.

Thanks Stuart

Sorry,

It's for a land rover discovery 3 2.7 v6 2005