GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

Annoying CEL code : P-0171

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Old 12-30-08, 11:09 PM
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VNN326
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Default Annoying CEL code : P-0171

well, i was just driving and a cel just went up from no where. i got the code read and it said it was P-0171 (system too lean). what should i change to fix this problem? thanks.
Old 12-30-08, 11:16 PM
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AYEmike
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The MAF sensor is dirty, take out and spray the MAF sensor with something like brake cleaner. make sure its dry before installing it back in. check for a dirty fuel filter also.
Old 12-31-08, 12:20 AM
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Debonair
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Originally Posted by fuzionn
The MAF sensor is dirty, take out and spray the MAF sensor with something like brake cleaner. make sure its dry before installing it back in. check for a dirty fuel filter also.
Do not get Brake Cleaner ANYWHERE near your MAF sensor. You can find a spray cleaner specifically made for MAF sensors at your auto parts store if you need to clean yours.

Fuzionn, are you aware that this car does not have a standard fuel filter? Its part of the pump.

Old 12-31-08, 12:21 AM
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kit cat
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and make sure you don't touch the element itself, it is VERY sensitive.
Old 12-31-08, 12:37 AM
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GS FONZy
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FYI - our cars are not known to have a fuel filter like other vehicles. There's a filter in the fuel pump, but does not need to be changed like on other cars that have a remote fuel filter.
Old 12-31-08, 10:07 AM
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VNN326
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so its most likely my MassFlow Air Sensor? not a fuel problem, thanks for the help guys.
Old 12-31-08, 03:14 PM
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dusouth
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same thing happen to me weeks ago (po171) maf sensor.

i used commpressed air to clean it out
Old 01-01-09, 08:14 AM
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Rock-a-Lex
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I was getting that for a while myself and my MAF was clean as a whistle and then I cleaned it again. Same code...how much for a new OEM MAF sensor? Can you get this on Ebay?
Old 01-01-09, 10:02 AM
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Sewell Lexus or PM Aligia
Old 01-03-09, 02:00 AM
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Clean your MAF. If doesn't work, maybe it's time for a new one. =)
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