P3138 AUDI, VOLKSWAGEN: INTAKE FLAP FOR AIRFLOW CONTROL CONTROL DIFFERENCE
POST UPDATED IN May, 2023
P3138 AUDI, VOLKSWAGEN: INTAKE FLAP FOR AIRFLOW CONTROL CONTROL DIFFERENCE
Vehicle manufacturers in certain cases employ a variable geometry intake manifold, which allows the airflow in the manifold to be changed for specific conditions. Under low-load situations, a long, thin manifold channel is ideal for flow velocity and swirl or turbulence. But in conditions requiring high load, a short runner is ideal.
Swirl velocity and intake turbulence are necessary to form and agitate the fuel mixture. For this, a position sensor can be attached to the control circuit to monitor the valve for electrical or mechanical failures. Also, the actuator can be tested to check the operation of the circuit, and live data can be used to validate the position feedback.
The P3138 OBDII diagnostic code on Audi and Volkswagen vehicles is set when a difference in airflow control of the intake manifold inlet flap is detected.
DTC P3138 OBD2 is set by one of the following factors:
To troubleshoot the P3138 OBDII fault code you must do the following: