Possible causes

– Faulty EVAP Canister Purge Regulator Valve
– EVAP Canister Purge Regulator Valve harness is open or shorted
– EVAP Canister Purge Regulator Valve circuit poor electrical connection

Symptoms

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

P1426 AUDI Description

Evaporative Emissions (EVAP) canister purge regulator valve in tank venting system or activation wire has a short circuit to ground.