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My Chilton's manual doesn't show a P0020, though the P0016/17 are
CKP-to-Intake/exhaust correlation so maybe it's not a part code but a "invalid value" code or calculation?
My codes when I had the problem were p0010 (Intake cam CMP, actuator circuit),
p0011 (Intake cam CMP, performance), and p0102 (MAF).
Good Luck!
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