why do i still have code p171

Question

i have a 05 tacoma v6,just changed termarstat,was running fine know light back on with code 171,i put a new mas,on code still there ,i checked for intake leak found none,HELP

Answer 1

How the sparkplugs, that a area that has to be checked, When it comes to Toyota lean condition can be set with worn spark plugs so that is a area that should be checked, This is where the history of the engine is good to know, no overheating condition, no combustion leakage into the radiator. have a good proper radiator cap and watch the radiator overflow for any bubble which would be combustion leakage from the cylinder. make sure you do not have that.