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P0091 engine code seems a kind of powertrain problem, we try to show one by one the meaning and the solution.
Brief explanation of the P0091 code and definition of P0091 is the bottom side.
Problem is related engine, transmission and emissions systems.
|0||SAE - Generic|
|0||Fuel And Air Metering|
|9||Crankshaft Position Sensor Circuit Performance|
|1||TFP Valve Position Switch-Drive Without Drive Ratio|
SAE - Generic codes, which have a '0' as their second digit to indicate they are common to all makes and models of vehicles. These are the codes that are required for basic emissions fault diagnosis.
How To Fix P0091 ?
Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0091 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.
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 P0091 engine fault code on your engine code reader this description will help you.
|P Codes||List of all Powertrain codes.|
Final Step: In the definitions listed below, there is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the P Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.
BE CAREFUL !
This engine code information is presented for information purposes only. This is not intended as repair advice and we are not responsible for any actions you take on any vehicle.