P3131 OBD Code Definition:
(EGR) Regulation Range not Reached
P3131 OBD Code Description:

Possible Symptoms

• Malfunction Indicator Light (MIL) ON

Possible Causes

• Exhaust Gas Recirculation (EGR) Valve (N18) faulty
• Exhaust Gas Recirculation (EGR) faulty

Possible Solutions

• Check/Replace Exhaust Gas Recirculation (EGR) Valve (N18)
• Check Exhaust Gas Recirculation (EGR) faulty