I have the C&L version of the Diablo sport for my 06 GT. Can I use it to read the codes on my 99 F150 4.2? Or would it mess up my tune.

 

I think your tuner is married to your can so it will not work on your truck. I pretty sure but not 100% sure

 

Like Glenn posted ! Your programmer is married to your car.. If your Diablo sport tuner is a canned programmer for more than just one vehicle ? You can use it on your truck providing you re-flash your Mustang back to stock first..

If your programmer is a custom mail order tuner specifically just for your Mustang ? Then no you cannot use it on another vehicle..

 

I know I can't tune with it. The question is can I pull the diagnostic codes with it. I read some where that you can. but I just wan't to make shure.

 

I'm 63% sure that you can use it to check codes on other cars.