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#1
02-20-2005, 11:54 AM
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System too lean?
I have a 2002 Celica and lately my check engine light has come on. I took it to Autozone to get checked. The code came out to be P0171. Which means System Too Lean (Bank 1). I have no idea what this means what so ever. Can anyone help me out or think they know what this could me?
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91 Eagle Talon ESI -new tires and rims - rebuilt tranny - rebuilt ECU -LOOKIN FOR A TURBO AWD DSM! HELP ME! 
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#2
02-20-2005, 10:29 PM
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Re: System too lean?
Check the following:
Air induction system Injector blockage MAF meter Engine coolant temperature sensor Fuel pressure and flow Exhaust leak Open or short in A/F sensor circuit A/F ratio sensor
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#3
02-24-2005, 03:31 PM
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po171 system too lean is caused by a faulty oxygen sensor, Bank 1 means that it is the first one closest to the motor on a four cyl. usually if something else it will come up with more than one code at the same time
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06 performance white 90 LX Hatch 5.0 swap
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#5
03-01-2005, 11:10 PM
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Re: System too lean?
Like he said, I had this same problem occur after a cold-air intake install.
The guy took it to a local repair shop that was doubling for parts changers and simply charged him $143 for an O2 sensor that he didn't need and used a Bosch Universal which made matters worse. Do the research and you can save yourself some serious headaches later.
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