Code P0174
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New User
Joined: Apr 2004
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From: San Antonio, TX
Code P0174
All,
I have a buddy that has a code of P0174 reading "system too lean" - bank 1 & 2
I have already changed the fuel filter on his vehicle and he is still getting this (what we beleive to be) fuel related code.
Any help is greatly appreciated.
I have a buddy that has a code of P0174 reading "system too lean" - bank 1 & 2
I have already changed the fuel filter on his vehicle and he is still getting this (what we beleive to be) fuel related code.
Any help is greatly appreciated.
Elder User
Joined: Sep 2006
Posts: 871
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I'd say most likely a vacuum leak.. or a dirty Mass Air Flow sensor.
Check all vacuum hoses and connectors.. if all good spray some carb cleaner around the intake mating surface with it idling.. if you notice a change in idle, you've found your leak. Some intake leaks are very small and can be very difficult to find... sometimes you just have to replace it and hope for the best.
First though you might try removing the MAF and cleaning it... that can cause goofy things with the fuel mixture.
Good luck.
Check all vacuum hoses and connectors.. if all good spray some carb cleaner around the intake mating surface with it idling.. if you notice a change in idle, you've found your leak. Some intake leaks are very small and can be very difficult to find... sometimes you just have to replace it and hope for the best.
First though you might try removing the MAF and cleaning it... that can cause goofy things with the fuel mixture.
Good luck.
Hotshot
Joined: Jul 2005
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New User
Joined: Apr 2006
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From: Macon
I am getting the same error on my 99 explorer. It started after I had the fuel system cleaned and after I reset it the check engine light comes on when I run the floor/defrost on my heater. It runs like a champ but is a pain having to reset it each time.
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