P0401 Exhaust Gas Recirculation Flow – Insufficient Detected Blocked hose between the purge valve and FTP sensor Faulty.EVAP Canister Purge Solenoid Valve circuit poor electrical connection.EVAP Canister Purge Solenoid Valve harness is open or shorted.Faulty EVAP Canister Purge Solenoid Valve.Note though that this is a rare event, and the fault must be sought elsewhere before any controller is replaced. In these cases, other codes may be present as well. Damaged, split, hardened, dislodged, or degraded vacuum lines.Damaged, burnt, shorted, corroded, and disconnected wiring and/or connectors.Defective purge valve and/or control solenoid. If the purge valve is located close to the canister, disintegrating charcoal can (and often does) enter vacuum lines, and eventually interfere with the operation of the purge valve. P1443 EVAP Emission CTRL System CTRL Valve Getting my 1996 Ford Ranger ready to pass a state emission inspection, I had to diagnose Ford trouble codes P0401 and P1443.
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