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if you clear the codes which one sets back first ?
do you have a good multi meter on hand ?
what O2 sensor amd Maf codes ?
you said P2101 ans P1517 both are throttle body codes that are set
follow this next
CIRCUIT DESCRIPTION The Throttle Actuator Control (TAC) System uses an ignition voltage supply separate from the powertrain control module (PCM) supply. If the PCM detects a voltage difference between the 2 circuits, this diagnostic trouble code (DTC) will set.DTC DESCRIPTOR This diagnostic procedure supports the following DTC:DTC P1682 Ignition 1 Switch Circuit 2CONDITIONS FOR RUNNING THE DTC
CONDITIONS FOR SETTING THE DTC
ACTION TAKEN WHEN THE DTC SETS
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