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all the codes you have listed are concerning the exhaust/emissions and random misfire , check all air intake hoses for leaks/wear etc ,check condition of spark plugs renew if in doubt ,take it from there
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
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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