If your RR has not had the DTCs (diagnostic trouble codes) cleared recently, you'll likely find a bunch. Almost all can be ignored, but you'll need to note what you have, clear the codes, and re-scan again after several thousand miles to see if there are any that return. And then you'll need to pick out what is really relevant, and not just a common message such as 'lost comms to xy ECU' with no real reason to worry.
Vehicle diagnostics is slightly more complex than making toast
But we are trying hard to make things easier for the novice.
RRC 2Dr, RRC 4Dr,
P38, and 2 L322s
(wife thinks I'm nuts - prob right, too)
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