Cel P0171

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Nov 6, 2003 | 04:10 PM

mahause

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From: Washington

Cel P0171

I have a 98 ranger xlt 2wd 4cyl. I have cleared this code but it comes back after about two days. The truck runs fine. I had the code pulled at autozone. It is "P0171 left bank lean." All fluid levels are normal and up to date. I have 131K miles on this truck. They told me running fuel injector cleaner through it might clear the problem. Does this sound right? If so what's a good brand to use? Thanks in advance.

Nov 6, 2003 | 04:23 PM

Richard4447

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Personally, I like the Chevron brand (Techron) that comes in the pump fuel as well. YMMV

EDIT: I couldn't remember the name of the additive but checked the website and Chevron has a $2.00 rebate as well if you want to spend the time, stamp and filling-in the blanks

http://www.chevron.com/prodserv/nafl...s_rebates.shtm

Nov 6, 2003 | 05:47 PM

Ken00

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From: South Jersey

Don't think it will work but you can give it a try. Check fuel pressure, look for vacuum/exhaust leaks, or bad O2 senser.

Mar 4, 2004 | 05:29 PM

mahause

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From: Washington

I tried a fuel injector cleaner and now the CEL comes on after about five days. Could this be a dirty MAF sensor?
Thanks.

Mar 4, 2004 | 05:47 PM

Rockledge

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From: Connecticut

Quote:

Originally posted by mahause
I tried a fuel injector cleaner and now the CEL comes on after about five days. Could this be a dirty MAF sensor?
Thanks.

Yes, a dirty MAF sensor can cause a lean condition:

https://www.ford-trucks.com/forums/s...hreadid=128532

You can try cleaning the MAF, you have nothing to lose:

https://www.ford-trucks.com/forums/s...hreadid=126093

Did you check for vacuum/exhast leaks like Ken suggested?

Mar 4, 2004 | 06:56 PM

mahause

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From: Washington

I have looked and listened and can't seem to find any leaks. Are there common problem areas that I should be aware of? I have noticed on the board that the PCV valve seems to be a common problem. Could this be related. Your help is appreciated.

Mar 4, 2004 | 07:42 PM

Rockledge

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From: Connecticut

Checking the seal of the PCV valve/grommet is a good idea, as a breakdown in that are could potentially allow unmetered air into the system. Which kinda leads to the next question ...has your engine been idling OK?

Fuel pressure check is probably next on the list.