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1999 Sc400 has code P1520 but no chk eng light on

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1999 Sc400 has code P1520 but the chk eng light does not stay on after car is on, I believe it might be the reason causing the car to idle 400-500rpm in drive, in neutral and park idles good, where do I start?

Vehicle: 1999,lexus,sc400,4.0

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Here is the diagnostic procedures

 

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