Yes, it is possible to reverse a DPF (Diesel Particulate Filter) delete, but the process can vary in complexity depending on how the delete was performed and the specific vehicle model. A DPF delete involves removing the diesel particulate filter from the exhaust system, often accompanied by modifications to the engine's ECU (Engine Control Unit) to disable DPF-related monitoring systems. This is typically done to improve engine performance, fuel efficiency, or reduce maintenance costs.