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Post by boluca on Mar 31, 2006 16:49:07 GMT -5
99 4Runner Limited, v6.
The check engine light keeps coming on. I had the codes read and it came up with a PO171 which they said was 'System Too Lean Bank 1'. The parts store said to replace the oxygen sensor before the cat. I changed it and the light comes back on after about 20 miles. The truck seems to run fine. It has 77k miles. Any ideas what this could be. I don't want to keep changing parts.
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Post by Hoodlum on Apr 13, 2006 11:10:22 GMT -5
99 4Runner Limited, v6. The check engine light keeps coming on. I had the codes read and it came up with a PO171 which they said was 'System Too Lean Bank 1'. The parts store said to replace the oxygen sensor before the cat. I changed it and the light comes back on after about 20 miles. The truck seems to run fine. It has 77k miles. Any ideas what this could be. I don't want to keep changing parts. Pull the EFI fuse from the fuse block that's in the engine compartment for at least 45 seconds re-insert. This will reset the ECU. If the CE light comes back on. Have them put the scanner back on it. You can also disconnect the battery for awhile and this is another way to reset the ECU. Try both before you have it scanned. |
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Post by BurntOrngeLonghorn on Apr 13, 2006 12:40:29 GMT -5
My 99 Tacoma has the same issue. Have you tried cleaning the MAF sensor with some break cleaner??
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Post by Hoodlum on Apr 13, 2006 12:57:56 GMT -5
No not the sensor itself but the inner part of the tube has been cleaned. The way things have been going it will probably blow on me  lol |
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Post by BurntOrngeLonghorn on Apr 13, 2006 14:37:44 GMT -5
I would suggest taking the sensor out and there is a little capacitor or resistor looking thing that's an amber color. If you look at it one side will look dirty from air being sucked in, just spray it lightly with some brake cleaner and it will clean it up for you.
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jz
Junior Member
'91 truck, downey t-bars, 33" dunlop mud rovers
Posts: 94
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Post by jz on Aug 16, 2006 21:49:03 GMT -5
BurntOrngeLonghorn is correct the resistor inside the MAF gets covered in dirt or whatever and does not read correctly and causes code P0171, i run into this code at work and thats exactly how i fix it.
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Post by nhrugga on Aug 29, 2006 16:56:46 GMT -5
;D
Rocking Post..I usually follow the SWAGO(Swap Out w/ A Good One) rule because it's what I do when fixing things at work..but a little quick dry electrical cleaner into the MAF sensor and she was running like a top again...saved me 90 bucks give or take
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jz
Junior Member
'91 truck, downey t-bars, 33" dunlop mud rovers
Posts: 94
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Post by jz on Aug 29, 2006 21:05:37 GMT -5
thats what we're here for
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