obd P0171 P0174 P1150 on 2001 Lexus RX300

I replaced MAF meter but CEL came back. engine is running fine, but bucked once when accelerating up a hill. no apparent vacuum leaks, air box clean, filter newer and clean. could i have bad gas? not making sense

by in Waukegan, IL on June 25, 2011
3 answers 3 comments
ANSWER by on June 25, 2011
Take it into a shop and spend some money !!!!!!!!!!!!!! Help the economy!!!!
COMMENT by on June 25, 2011
i would if the economy wasnt effecting my pocket book. thanx for the suggestion Anonymous!
COMMENT by on June 25, 2011
sorry for that response. it has a vacuum leak as I said in a past answer. you will need a shop with a scanner to monitor the short and long term fuel trims to verify. not something you can diag without the right stuff. Roy
COMMENT by on June 25, 2011
thanx Roy. ive removed the air box and plastic engine cover so i can follow all vacuum lines, so far all is good. i realize i need correct tools but hasnt stopped me from trying to find the obvious. im a system tech by trade and its my personality to investigate. ur reply is appreciated!
ANSWER by on June 25, 2011
Check the code reading again ans see if a differant code comes up...Autozone will check it for you for free.
ANSWER by on June 26, 2011
P0171 bank 1 too lean, P0174 is bank 2 too lean, P1150 Air Fuel Ratio sensor malfunction bank 2 sensor 1, I would be looking at that O2 sensor reading on the scantool to see how it reads compared to the other bank.
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