Hi All,
I have camry LE 1999 model(4 cylinder). I have the check engine light on for last few months. I ignored it as there is no problem in use. I have the inspection due by the end of september. I read somewhere that the P0171(System is too lean on bank1) is due to the dirty maf(mass airflow sensor). How can I clean it, is it safe to clean my own.
I heard that is very expensive piece.

Also, I haven't done any filters changed for last 90 thousand miles. Would that be a cause of the "light on"

Any input is appreciated.

Thanks

This won't be identicle to your car but, should give you the general idea: http://www.lexusownersclub.co.uk/knowledge/index.php?page=index_v2&id=152&c=11

A little more info: http://www.obd-codes.com/trouble_codes/generic/p0171-system-too-lean-bank-1-oxygen-sensor.php

Download your factory maintenance manual from the Factory Service Manuals thread at the top of the forum. The FAQs thread should also have more info.

MAF sensor should cost $150-$200 for your car. May be cheaper on the net. Maybe Ebay.

keep in mind po171 is one of the hardest codes to diagnose for the do it your selfer. could be a vaccuum leak, fuel system problem, maf mentioned above etc... becareful with diagnosis.

http://www.automotiveforums.com/vbulletin/showthread.php?t=732698

Different engine, same problem to solve

MAF meter resistance and long-term vs short-term fuel trim will determine whether it is the MAF meter or not. Resistance will diagnose ECT sensor.