The engine code P0381 is a valuable thing. If your catalytic convertor flops totally, you finally will not be able to retain the car running. Your gas mileage will also be awful, so you should try and hit it as soon as you can. Inappropriately, the average extra cost is about $2,000 and you cannot do it yourself unless you are an skilled mechanic. The automobile meaning of the code is P for OBD-II Diagnostic Powertrain (P) Trouble Code For Engine. 0 for Intake Valve Control Solenoid Circuit Low. 3 for Engine Oil Temperature Sensor Malfunction. 8 for Cylinder 10 Contribution/balance Fault and 1 for Exhaust Gas Recirculation Sensor B Circuit High.