Question about 2000 Lexus RX 300

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The car doesn't have power when hit the gas pedal speed pick up really slow also have code of 171 sistem too lean on bank one,lexus 2000 rx 300

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This code sets when air fuel ratio feedback is stable after engine warm up,and fuel trim is considerably in error on lean side;The signal from air fuel ratio sensor is approximatelyproportional to existing air-fuel ratio.

for this code suspect excessive lean condition,normal rangefor total trim is between -35% to +35%,DTC uses "two-trip detection Logic".

Check system for intake leaks,incorrect fuel pressure,plugged fuel injectors,O2 sensor or coolant sensor operation.

check air-fuel ratio sensors
to do it you need to check them with a good scanner tool.

also,check MAF sensor operation.

personally i would clean with the special spray for MAF sensor (you can get it from you autoparts store) and try a fuel injector cleaner before start spending money in shops.

hope this info can help you.

Posted on Sep 24, 2009

Testimonial: "I clean MAF sensor,change air,cabin filter,fuel injector cleaner,car run smoother,but ENG light come back on w/ same code please help,changeMAF sensor"

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What does P0171 system to lean bank 1 mean on my 2000 Lexus RX300?


Try this little cheap trick, happens all the time

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What does code system to lean bank 1 mean on my 2000 lexus rx300


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YOU COULD HAVE AIR LEAKS AFTER THE MASS AIR FLOW SENSOR OR IN THE EGR OR PVC SYSTEM.YOU HAVE A MECHANICAL FAULT AFFECTING ONE OR MORE CYLINDERS EXHAUST LEAKS LOCATED IN FRONT OF THE A / FS OR HEATED OXYGEN SENSOR LOCATION.FUEL SYSTEM SUPPLYING TOO LITTLE FUEL DURING CRUISE OR IDLE FAULTY FUEL PUMP OR FUEL FILTER.FUEL INJECTOR ONE OR MORE DIRTY OR PRESSURE REGULATOR HAS FAILED.THESE ARE THE POSSIBLE CAUSES TO YOUR PROBLEM.

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1 Answer

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What was the code? lean mixture? If so make sure there is no leak in the exhaust. I have worked on a lexus suv, but it was an 89. It had a lean mixture code. After examination I noticed a exhaust leak which was not apparent at first, there is a section in the exhaust the is very thin, and prone to leakage, causing the lean mixture code.

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