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Depends how much you want to spend I have a Topdon small scanner (which measured my failing fuel rail pressure HPF pump issue) & Foxwell Elite NT624 with free lifetime updates covers everything needed for most European cars & all systems
Because I'm an idiot and have owned lots of Peugeots I bought PP2k/Lexia/Diagbox and a laptop. It's what they use at Peugeot when you go in for a diagnostic, it does everything. Live data, Code reading and resetting, VIN coding, the lot.