DTC P0440 Audi

Description

ECT sensor is cold during startup, engine started, battery voltage must be at least 11.5v, all electrical components must be off, parking brake must be engaged (to keep daytime driving lights off), automatic transmission selector must be in park, the exhaust system must be properly sealed between the catalytic converter and the cylinder head, coolant temperature must be at least 80 degrees Celsius and oxygen sensor heaters for oxygen sensors before the catalytic converter must be functioning properly and the ground between the engine and the chassis must be well connected. The ECM detected the switch rate of the rear HO2S-12 was close to the switch rate of front HO2S (it should be much slower). ECM detected a problem in the EVAP system during the EVAP System Monitor test.