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Bought another OBDI reader: ADOTER ADN 200 which reportedly works with a 2002 Jaguar XKR but goes through all of the power up tests then indicates "COMMUNICATION ERROR"
Same thing with my other reader !!! Anyone have an answer ??
I had someone connect a code reader with my car running and it caused a 'Restricted Performance" error until I started it about 3 times.
i guess I wasn't being very clear. I'm not checking for fault codes, I'm more interested in engine temperature, transmission temperature, oil pressure, etc. that kind of thing. Engine off would do me no good.
However, the cheapie code / data readers would not connect on my car engine off, engine on, nada.
I see now. I bought a $20 transmitter that plugs into the ODB-II port and connects via Bluetooth to a free app on my Android phone. I can set up custom readouts/gauges.
I used this after fixing my octopus hose leaks to monitor coolant temp. Worked great.
Don't leave it plugged in though- drained my battery.