P0490 Mercury Exhaust Gas Recirculation Throttle Control Circuit A Circuit High

Possible causes

– Faulty Exhaust Gas Recirculation (EGR) Solenoid
– Exhaust Gas Recirculation (EGR) Solenoid harness is open or shorted
– Exhaust Gas Recirculation (EGR) Solenoid circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0490 Mercury Description

The Engine Control Module (ECM) does not detect voltage on the Exhaust Gas Recirculation (EGR) Solenoid circuit.