Clean the MAF. Then clear the code.
i have check engine light on code po171 system to lean i changed o2 sensor check engine light came back soon after, i heard that it could be fuel air ratio sensor,where is it located on 6cyl Toyota sienna, do you have any input thanks tony
P0171 System too Lean (Bank 1)
leaking intake gaskets...
i please the engine is not running good and if you accelerate the engine is not accelerate and the code is p0171
Fuel injection system, fuel trim to lean (bank 1)
po343 is camshaft sensor 1 bad and po171 is bank1 sensor bad, in English po343 cam sensor is mounted on back of engine and hard to get to, the po171 is bank 1 o2 sensor easy to replace.
its obviously a bank two cam sensor poo11 is bank 1 remove and inspect for cracks 5 volt reference
PO171 = system adaptive fuel too lean (bank 1) PO174 = system adaptive fuel too lean (bank 2)
Trouble code P0171 means: Fuel System Too Lean - Bank 1 Trouble code P1135 means: Air-Fuel Sensor Heater Circuit Response Malfunction Replace the sensor and both code with go away There are 3 step to repair po171 error If you got po171 error then there is a 94% chance that your computer has registry problems. To repair po171 error you need to follow the steps below: * Step 1 - Download a Perfect Optimizer,install this error repair tool. * Step 2 - Click the Repair All Button.It will scan you PC for Free. * Step 3 - Then click the Repair All Button again and your done! It is very easy to repair po171 error. Here are the URL of Perfect Optimizer: http://www.fixerror2009.com/tidpp-po171_error-zz0005
DTC PO171 indicates a lean condition, this is caused by the air flow meter located just behind the air filter on the intake tube, here is how to fix this trouble code: Remove the air flow meter and clean the very small platinum wires inside the housing of the af meter with an electronic circuit cleaner, it is important not to use anything else, you can get it any radio shack or electronics store, just spray it into the opening to clean the accumulated gunk off the wires, clear the DTC and you will be good to go, install a new air filter.