What does it mean?
OBD II fault code P02E0 is a generic diagnostic trouble code defined as Diesel Intake Air Flow Control Circuit/Open. It is set when the PCM detects the difference between the intake control valve’s actual and desired position. Or, to put it simply, this code is triggered when this device doesn’t open and close as the PCM would want it to. This explanation may raise some eyebrows, as many of you know that Diesel engines don’t have a throttle body.
And that is partially true because, unlike gasoline engines, the engine’s speed is controlled by the amount of injected fuel. Many car makers, however, have recently started fitting Intake Air Flow Control devices – or throttle bodies, if you will – to their diesel engines to reduce emissions. Their job here is to work in pairs with the EGR system and improve its efficiency.
When the conditions are right, this Intake Air Flow Control device partially closes, which creates a vacuum inside the intake manifold. This consequently speeds up airflow, which mixes up with gasses from the EGR system more efficiently. Although the P02E0 trouble code is generic, this article will focus on Ford and Mazda vehicles with a 3.2-liter 5-cylinder diesel engine. This unit was used in many Transit vans, Rangers, and BT50 models manufactured from approximately 2000 onwards.