99 camry 4cyl P0171 - Toyota Nation Forum : Toyota Car and Truck Forums


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3rd & 4th Generation (19921996 & 19972001) Toyota Camry Discussion for years: 1992-1996 & 1997-2001 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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Old 02-04-2011, 08:22 AM   #1 (permalink)
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99 camry 4cyl P0171

I pulled a code this morning from my 99 camry le and it was P0171 "system too lean bank 1". Any ideas of where to start troubleshooting?
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Old 02-04-2011, 09:29 AM   #2 (permalink)
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Has anything been done to it recently? Start with the air filter box and make sure it's properly installed and not leaking. Then follow the large intake hose and check for cracks or leaks and do the same for all air/vacuum hoses.
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Old 02-04-2011, 09:30 AM   #3 (permalink)
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Any other codes?
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Last edited by csaxon; 02-04-2011 at 09:50 AM.
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Old 02-04-2011, 09:36 AM   #4 (permalink)
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I've recently had sparks, wires, and pcv valve changed. I also wanted to get the fuel filter changed but the guy said he couldn't get the old filter off.
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Old 02-04-2011, 09:37 AM   #5 (permalink)
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There are no other codes showing.
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Old 02-04-2011, 10:00 AM   #6 (permalink)
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Email sent with some info.

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Originally Posted by chazdiezal View Post
There are no other codes showing.
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Old 02-04-2011, 10:04 AM   #7 (permalink)
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Old 02-04-2011, 10:11 AM   #8 (permalink)
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Your mechanic may have removed the air box to get to the fuel filter and not put it together properly.

Possible causes:
Air intake (hose loose)
Fuel line pressure
Injector blockage
Heated oxygen sensor (bank 1 sensor 1)
Manifold absolute pressure sensor
Engine coolant temp. sensor

Also, look at your fuel filter and see if the mechanic used brute force and twisted the fuel line; reducing fuel flow.
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