another PO171 code...
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Don't spend too much time trying to diagnose a bad MAF sensor. I learned the hard way. I had a bad sensor which was running the mixture way too rich. I tried cleaning it, ignoring it, etc.
The bad fuel/air mixture tanked my catalytic converters. I'm embarassed to tell you what that cost me. MAF's are cheap by comparison!
The bad fuel/air mixture tanked my catalytic converters. I'm embarassed to tell you what that cost me. MAF's are cheap by comparison!
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Update: 9/25/06
Again, yotatech comes up w/ the right answer. I changed my MAF (thanks to Evan at Northridge Toyota for a great deal) last week and no CEL. I didn't want to post until I had a week code-free.
I did change my A/F sensor first, which may not have been the reason for the code but at 100k miles, I figured I'd need a new one sooner or later.
Again, yotatech comes up w/ the right answer. I changed my MAF (thanks to Evan at Northridge Toyota for a great deal) last week and no CEL. I didn't want to post until I had a week code-free.
I did change my A/F sensor first, which may not have been the reason for the code but at 100k miles, I figured I'd need a new one sooner or later.
#25
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Update: 9/25/06
Again, yotatech comes up w/ the right answer. I changed my MAF (thanks to Evan at Northridge Toyota for a great deal) last week and no CEL. I didn't want to post until I had a week code-free.
I did change my A/F sensor first, which may not have been the reason for the code but at 100k miles, I figured I'd need a new one sooner or later.
Again, yotatech comes up w/ the right answer. I changed my MAF (thanks to Evan at Northridge Toyota for a great deal) last week and no CEL. I didn't want to post until I had a week code-free.
I did change my A/F sensor first, which may not have been the reason for the code but at 100k miles, I figured I'd need a new one sooner or later.
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Only thing Jaime is I'm not getting mpg w/ both a new A/F sensor and MAF sensor. I wish I was...
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I just replaced my MAF, no luck getting rid of the code. But, what is this A/F sensor? i thought it was the MAF sensor. I guess im wrong, Sorry for being an idiot.
#28
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In most cases the P0171 indicates a bad MAF sensor (sometimes they can be cleaned, sometimes they need to be replaced as it did in Edwin's case). The other possibility for the code is likely the A/F sensor (on trucks 99-02, the front O2 sensor was replaced by what is called an Air/Fuel sensor). There are a few places to get them cheaper if you do a search on YT (Evan - Northridge, Phil - strapp22 or URD).
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Well then that is why i dont know about the A/F sensor. My rig is a 96 runner.
But that is my next step is to change the first O2 sensor. I just bought a new MAF and no luck with that, just a huge dent in my pocket . Maybe ill pick up an O2 sensor today, ofcoarse an OEM Denso. The NAPA by me carries them for $100, AutoZone/Checker for $130. And I seen Gadget has them for $80. Ill just get one now, instead of having to wait for shipping. Hehehe, Ill just milk the clock today for 1.5 hours. to make up for that $20.
But that is my next step is to change the first O2 sensor. I just bought a new MAF and no luck with that, just a huge dent in my pocket . Maybe ill pick up an O2 sensor today, ofcoarse an OEM Denso. The NAPA by me carries them for $100, AutoZone/Checker for $130. And I seen Gadget has them for $80. Ill just get one now, instead of having to wait for shipping. Hehehe, Ill just milk the clock today for 1.5 hours. to make up for that $20.
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Well then that is why i dont know about the A/F sensor. My rig is a 96 runner.
But that is my next step is to change the first O2 sensor. I just bought a new MAF and no luck with that, just a huge dent in my pocket . Maybe ill pick up an O2 sensor today, ofcoarse an OEM Denso. The NAPA by me carries them for $100, AutoZone/Checker for $130. And I seen Gadget has them for $80. Ill just get one now, instead of having to wait for shipping. Hehehe, Ill just milk the clock today for 1.5 hours. to make up for that $20.
But that is my next step is to change the first O2 sensor. I just bought a new MAF and no luck with that, just a huge dent in my pocket . Maybe ill pick up an O2 sensor today, ofcoarse an OEM Denso. The NAPA by me carries them for $100, AutoZone/Checker for $130. And I seen Gadget has them for $80. Ill just get one now, instead of having to wait for shipping. Hehehe, Ill just milk the clock today for 1.5 hours. to make up for that $20.
Did you try to also search for vacuum leaks as this can cause the same code? I did check but didn't notice anything on mine.
#31
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Well then that is why i dont know about the A/F sensor. My rig is a 96 runner.
But that is my next step is to change the first O2 sensor. I just bought a new MAF and no luck with that, just a huge dent in my pocket . Maybe ill pick up an O2 sensor today, ofcoarse an OEM Denso. The NAPA by me carries them for $100, AutoZone/Checker for $130. And I seen Gadget has them for $80. Ill just get one now, instead of having to wait for shipping. Hehehe, Ill just milk the clock today for 1.5 hours. to make up for that $20.
But that is my next step is to change the first O2 sensor. I just bought a new MAF and no luck with that, just a huge dent in my pocket . Maybe ill pick up an O2 sensor today, ofcoarse an OEM Denso. The NAPA by me carries them for $100, AutoZone/Checker for $130. And I seen Gadget has them for $80. Ill just get one now, instead of having to wait for shipping. Hehehe, Ill just milk the clock today for 1.5 hours. to make up for that $20.
Last edited by MTL_4runner; 09-26-2006 at 06:16 AM.
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Well, My truck is S/C'd, and didnt the light didnt come on for about 500 miles after it was put on. If any knows a reason for that. Ill try the O2 sensor as i said and see if that helps it. Thanks for the replies!
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Well, After looking over the hoses on my truck, I did notice a Hissing noise comming from the S/C. All my hoses are correct and okay. But I have the GEN I S/C (the grey one). And the hissing is comming from the "thing" near the bypass vavle. I dont know what its called But its like a rectangled piece that fits into the intake part then turns into a cylinderish piece next to the bypass valve.....
Anyways I think this is the main culporate to my "Bank 1 Too Lean" code. As the truck gets up to temp, Its starts to run pretty rough (engine rocks back and forth). I then place my hand over the part thats leaking and it idles back to normal, which is smooth running. Is there anyone out there with they Grey S/C? I think Gadget has one but I would think he has upgraded to the newer one.
My Question is now, am I able to use the Hi Temp Gasket maker to put in the part that is sucking in extra air? Because I cannot find anything about a true Gasket for that area. Thanks for the help!
Anyways I think this is the main culporate to my "Bank 1 Too Lean" code. As the truck gets up to temp, Its starts to run pretty rough (engine rocks back and forth). I then place my hand over the part thats leaking and it idles back to normal, which is smooth running. Is there anyone out there with they Grey S/C? I think Gadget has one but I would think he has upgraded to the newer one.
My Question is now, am I able to use the Hi Temp Gasket maker to put in the part that is sucking in extra air? Because I cannot find anything about a true Gasket for that area. Thanks for the help!
#34
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Well, After looking over the hoses on my truck, I did notice a Hissing noise comming from the S/C. All my hoses are correct and okay. But I have the GEN I S/C (the grey one). And the hissing is comming from the "thing" near the bypass vavle. I dont know what its called But its like a rectangled piece that fits into the intake part then turns into a cylinderish piece next to the bypass valve.....
Anyways I think this is the main culporate to my "Bank 1 Too Lean" code. As the truck gets up to temp, Its starts to run pretty rough (engine rocks back and forth). I then place my hand over the part thats leaking and it idles back to normal, which is smooth running. Is there anyone out there with they Grey S/C? I think Gadget has one but I would think he has upgraded to the newer one.
My Question is now, am I able to use the Hi Temp Gasket maker to put in the part that is sucking in extra air? Because I cannot find anything about a true Gasket for that area. Thanks for the help!
Anyways I think this is the main culporate to my "Bank 1 Too Lean" code. As the truck gets up to temp, Its starts to run pretty rough (engine rocks back and forth). I then place my hand over the part thats leaking and it idles back to normal, which is smooth running. Is there anyone out there with they Grey S/C? I think Gadget has one but I would think he has upgraded to the newer one.
My Question is now, am I able to use the Hi Temp Gasket maker to put in the part that is sucking in extra air? Because I cannot find anything about a true Gasket for that area. Thanks for the help!
#35
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Well, After looking over the hoses on my truck, I did notice a Hissing noise comming from the S/C. All my hoses are correct and okay. But I have the GEN I S/C (the grey one). And the hissing is comming from the "thing" near the bypass vavle. I dont know what its called But its like a rectangled piece that fits into the intake part then turns into a cylinderish piece next to the bypass valve.....
Anyways I think this is the main culporate to my "Bank 1 Too Lean" code. As the truck gets up to temp, Its starts to run pretty rough (engine rocks back and forth). I then place my hand over the part thats leaking and it idles back to normal, which is smooth running. Is there anyone out there with they Grey S/C? I think Gadget has one but I would think he has upgraded to the newer one.
My Question is now, am I able to use the Hi Temp Gasket maker to put in the part that is sucking in extra air? Because I cannot find anything about a true Gasket for that area. Thanks for the help!
Anyways I think this is the main culporate to my "Bank 1 Too Lean" code. As the truck gets up to temp, Its starts to run pretty rough (engine rocks back and forth). I then place my hand over the part thats leaking and it idles back to normal, which is smooth running. Is there anyone out there with they Grey S/C? I think Gadget has one but I would think he has upgraded to the newer one.
My Question is now, am I able to use the Hi Temp Gasket maker to put in the part that is sucking in extra air? Because I cannot find anything about a true Gasket for that area. Thanks for the help!
I think AJatx just had almost the exact same issue you are having:
https://www.yotatech.com/forums/f2/p0171-trouble-root-causing-95672/
An auto parts store should have o-ring kits with what you need.
Last edited by MTL_4runner; 10-02-2006 at 07:12 AM.
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