Buy a can of Mass Air Flow cleaner. Clean your air flow meter which is attatched to the air box. If you have access to a scan tool look at the live data and under Mass Air Flow it should read 14kg/h. If it is at 16 to 20kg/h it is too high. If your tool reads g/s it should be around 3.75g/s to 4.00g/s. I chased this problem for weeks trying everything.
CODE P1171 IS SYSTEM TOO LEAN BANK 1 PART LOAD.
What needs to be done to fix it?
POSSIBLE CAUSES : FUEL FILTER CLOGGED RESTRICTED, FUEL INJECTORS DIRTY OR RESTRICTED, FUEL PRESSURE REGULATOR HAS FAILED NOT SUPPLYING ENOUGH FUEL.WATER OR ALCOHOL IN FUEL LOW HO2S SIGNAL DURING ACCELERATION.CHECK FUEL PRESSURE MAKE SURE FUEL PUMP NOT TOO WEAK. FUEL PRESSURE SHOULD BE 55 PSI. THAT WITH NEW FUEL FILTER REPLACEMENT, CLEAN FUEL INJECTORS, CHANGE FUEL FILTER,THAT SHOULD HELP,IF ALL IS GOOD FUEL PUMP AT FAULT IF FILTER BEEN CHANGED AND FUEL PRESSURE REGULATOR OKAY.CHECK FUEL PRESSURE REGULATOR VACUUM HOSE FOR ANY SIGNS OF GAS IF YES THE FUEL PRESSURE REGULATOR DIAPHRAM RUPTURE ,FUEL PRESSURE REGULATOR NEED REPLACING.
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