[matthewb0051]

As others have said, you really need to look at the terms of your agreement with the shop that conducted the PPI. That should contain the substance of your agreement with them and if they are or are not liable for things if they somehow fail to uncover. If you don't have a written agreement with them then it will be incredibly hard to enforce some standard on them unless the state has regulatory guidance or law on what is to be covered in a PPI and also unless that guidance or law speaks as to liability.

My .02 and not intended as legal advice. I'm not licensed in any of the referenced states.

Of course this also swings on the type of car purchased and for how much. That info will seriously help in the quality of advice you receive both here and with a lawyer. You may be at a price point where the juice is not worth the squeeze. That sucks but it is also reality (been there recently myself).