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 check engine light,code p0171
#732729
06/22/06 03:27 AM
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Anonymous
Unregistered
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my check engine light came on and i retrieved a code p0171.i have a 2000 prerunner with a v6 and automatic.105,000 miles.bought it used and it had 93,000 on it.i had the timing belt,pulleys,waterpump,thermostat ect. replaced right after i bought it,i also put a k&n airfilter in about 4000 miles ago and was reading about that and some of its problems in here.i cleared the code and the light hasnt come on but its only been a day,i know things dont fix themselves.any ideas,thanks
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Re: check engine light,code p0171
#732730
06/22/06 04:02 AM
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Joined: Oct 2004
Posts: 6,332
Trail Leader
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P0171= fuel trim lean, bank 1.
Did you by chance recently oil your K&N?
1990 Montero RS (In pieces... for now)
KG6VNX
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Re: check engine light,code p0171
[Re: 52degrees]
#732731
06/22/06 04:08 AM
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Anonymous
Unregistered
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no,its only got about 4000 miles on the filter
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Re: check engine light,code p0171
#732732
06/22/06 05:31 AM
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Anonymous
Unregistered
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Its your MAF sensor, Try cleaning it with the recomended procedures under the 30K maint. list. otherwise I had the same code about 5 months ago, ended up replacing the whole sensor. These tacomas are really sensitive when it comes to foreign matter on the sensor, basically the sensor works on electrical resistance, i.e. the more dirt, dust etc.. that collects the hotter the resistance and thus throwing a code on the computer, try cleaning if not replace.
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Re: check engine light,code p0171
#732733
06/22/06 11:13 AM
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Joined: Sep 2003
Posts: 146
Wheeler
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It could also be the front O2 sensor. They do go out and it's cheaper than a new MAF. But clean the MAF sensor first as suggested earlier since that's the cheapest option.
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Re: check engine light,code p0171
[Re: bard]
#732734
06/22/06 02:17 PM
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Anonymous
Unregistered
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thanks for the suggestions,ill clean it tonite after work.where is the front o2 sensor located?
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Re: check engine light,code p0171
#732735
06/22/06 07:38 PM
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Joined: Sep 2003
Posts: 146
Wheeler
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In front of the cat. Are you sure you know how to clean a MAF? Break an element and it's toast <img src="/forums/images/graemlins/zombie.gif" alt="" />
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Re: check engine light,code p0171
[Re: bard]
#732736
06/23/06 02:19 AM
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Anonymous
Unregistered
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ive got the cleaner and the tools to do it so ill give it a shot.ive worked alot on older trucks,just not real knowlegable on newer trucks with computers.thanks
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Re: check engine light,code p0171
#732737
06/23/06 02:33 AM
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Joined: Oct 2004
Posts: 6,332
Trail Leader
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BTW, K&N filters cause drivability problems. The oil gets on MAF sensor wires and insulates them, causing them to give false airflow readings.
There are also many studies that indicate that K&N air filters allow a lot more dirt to pass through than paper filters. Toyota makes about the best air filter out there, in my professional experience (I'm a licensed smog tech in Kalifornia and an ASE Master tech).
My best advise to anyone with a Mass AirFlow sensor (MAF) is to stick with the factory paper filter and stay as far away from K&N filters as humanly possible.
1990 Montero RS (In pieces... for now)
KG6VNX
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Re: check engine light,code p0171
[Re: 52degrees]
#732738
06/23/06 12:52 PM
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Joined: Apr 2000
Posts: 3,748
Toyota Moderator
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BTW, K&N filters cause drivability problems. The oil gets on MAF sensor wires and insulates them, causing them to give false airflow readings.
There are also many studies that indicate that K&N air filters allow a lot more dirt to pass through than paper filters. Toyota makes about the best air filter out there, in my professional experience (I'm a licensed smog tech in Kalifornia and an ASE Master tech).
My best advise to anyone with a Mass AirFlow sensor (MAF) is to stick with the factory paper filter and stay as far away from K&N filters as humanly possible. <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />
2000 4Runner,V6,Auto,31's, Sliders, Skids, On-Board Air, Air Shocks Related Interests: Welding, Ham Radio, Road Tripping (Blue Highways), High End Video/Audio Systems
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