P1031 OBD Code Definition:
P1031 Intake Manifold Air Control Valve Position Sensor Specification Not Attained
P1031 OBD Code Description:

Possible Causes

• Intake Manifold Flap blocked/tight
• Intake Manifold Tuning Valve faulty
• Intake Manifold Tuning Valve Position Sensor faulty

Possible Solutions

• Check Intake Manifold Tuning Valve
• Check Intake Manifold Tuning Valve Position Sensor
• Check Intake Manifold Flap