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I would first clear the codes and see what comes back. I had a stored (no CEL) 1531 code that never came back after being cleared. Then, I would work on the O2 sensor error codes and see if you can resolve them.
The last thing i would do is dig into the cam actuators. +-6 is the limit on cam deviation, but if you are not having any performance problems, why do anything.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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