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Definition of Diagnostic Trouble Code P0106
Category:
Powertrain
Definition:
Manifold Absolute Pressure/Barometric Pressure Circuit Range/PerformanceNote: This definition of P0106 is applied to all manufacturers
Definition of Diagnostic Trouble Code P0121
Category:
Powertrain
Definition:
Throttle/Pedal Position Sensor/Switch "A" Circuit Range/PerformanceNote: This definition of P0121 is applied to all manufacturers
The P0102 means Mass or Volume Air Flow Circuit Low Input The P0101 means Mass or Volume Air Flow Circuit Range/Performance Problem The P0300 means Random/Multiple Cylinder Misfire Detected The P0171 means System too Lean (Bank 1) _________________ Ktag ecu programmer
1174 is a lean code, and would have to been set first because it will not set when the 0300 is there. 0300 is a random misfire, because it read after the lean code, it was probably caused by the lean condition. 1st check for vacuum leaks from hoses or intake gaskets, you cal listen for a hissing sound, or spray carb cleaner around intake systems, a change in rpm will be noticed when spraying near a vac leak. other probable causes are the upstream 02 sensor, map sensor, or fuel delivery problems. does the vehicle idle porly, or does it miss at the top end?
all of the above codes seem to have a common cause, they all list a bad ecm (computer) as being a cause, and the last code P0601 points specifically to a bad computer. sorry for the bad news, hope this helps.
Remove the housing that covers the engine block and look behind the engine block, up against the firewall towards the bottom of the block there are some vaccum hoses(this is easier to get too if the car is up in the air, or lifted on jack stands) get yourself a aerosall can of brake cleaner and lightly spay around all the hoses til you find your leak( the vehicle must be running) be very careful cause the fluid you spray can catch fire if it hits the exhaust manifold when it gets hot. good luck
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