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Old 08-04-2011, 03:18 PM
Join Date: May 2009
Posts: 63
Default Resetting P0171 code.

Hello everyone. I have a 2000 S40, 181K miles on it. I have a MAF sensor code of P0101, and a a fuel trim code of P0171. Car running poorly, not starting. I know that my replacement of my MAF sensor (which I will be doing in the next 7 days) may clear up the condition that caused the fuel trim code to come up (it should eliminate the P0101 code), but I have read that after I remedy the condition that caused the fuel trim code to come up that I need to RESET the fuel trim. I do not know how to reset the fuel trim. My VADIS says that I can use a VCT2000 to do it, which I understand is a computer product to read and clear codes from the ECM. However, I have an OBD II scanner that I used to pull the codes that I have. Can I use the OBD II to clear the fuel trim code (the P0171)? When I clear that code on the OBD II, does that "reset" it? Or do I have to go to something like the VCT2000 to "reset" it? Thanks for reading this. Chris
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Old 08-06-2011, 09:52 AM
Hudini's Avatar
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Join Date: Oct 2007
Location: Shanghai, China
Posts: 2,260
bigdawg Orange

I've always reset the fuel trims by disconnecting the battery for 15 minutes or more and cleared the codes using the OBD-II scanner.
1976 240 DL
1986 240 GL
2001 S40 1.9T
2005 S40 T5 AWD

You can have it done QUICKLY, done INEXPENSIVELY, done CORRECTLY. Pick any two.
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Old 08-22-2011, 12:33 PM
Join Date: May 2009
Posts: 63

Thanks Hudini. Your advice worked. Took me some time to get back to you. Code is gone, and with new (used) MAF sensor it has stayed gone.
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