What does P0951 Mean? The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. When you see P0951 engine fault code on your engine code reader this description will help you. engine code P0951P0951 fixobd P0951dtc P0951obd code P0951obd2 P0951P0951 car codediagnostic code P0951car code P0951check engine code P0951fehlercode P0951P0951 fiatcodigo P0951codigo falla P0951P0951 kody b??dówcodigo de falla P0951 What are the common causes of P0951 ? Faulty Auto Shift Manual Switch Auto Shift Manual Switch harness is open or shorted Auto Shift Manual Switch circuit poor electrical connection How do you troubleshoot P0951 ? If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Searches related to P0951 Code - Auto Shift Manual Control Circuit Range/Performance P0951 P0952