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post #1 of 6 (permalink) Old 01-17-11, 06:12 AM Thread Starter
97 Explorer 4x4 4.0L SOHC
 
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Code P-0171 / P-0174

The check engine light came on in my 1997 ford explorer 4.0L SOHC. I took it to the shop and they said it was:

*P 0171 BANK 1 LEAN.

*P 0174 BANK 2 LEAN.

He gave me a few things that could be wrong.

1. Intake gasket leaking
2. Bad MAF
3. Bad DPFE

They want to do an air leak test. Im not sure what that test does.

I dont want to just start throwing parts at it. What is wrong with it???


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post #2 of 6 (permalink) Old 01-17-11, 06:16 AM
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Re: Code P-0171 / P-0174

Quote:
Originally Posted by MeanJoeGreene View Post
The check engine light came on in my 1997 ford explorer 4.0L SOHC. I took it to the shop and they said it was:

*P 0171 BANK 1 LEAN.

*P 0174 BANK 2 LEAN.

He gave me a few things that could be wrong.

1. Intake gasket leaking
2. Bad MAF
3. Bad DPFE

They want to do an air leak test. Im not sure what that test does.

I dont want to just start throwing parts at it. What is wrong with it???

Hello and good day:

Clean the MAF, and Replace the DpFe....these are the most comon causes for the Code.

Good Luck and good repairing Sterling_6
"You know, just like in that Book, When Jesus beats up Moses to get Religion!!"
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post #3 of 6 (permalink) Old 01-18-11, 03:46 AM Thread Starter
97 Explorer 4x4 4.0L SOHC
 
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Location: Salem, Oregon
Posts: 17
Re: Code P-0171 / P-0174

I cleaned the MAF. I will replace the DPFE next. This engine VERY cold-blodded. I need to keep pushing on the gas pedal to keep it running when I first start it in the morning, but when it is warmed up, I dont have any other trouble all day, it runs like a champ.

Thanks for the help. I will keep ya posted.

"I'm polymerized tree sap and you're an inorganic adhesive, so whatever verbal projectile you launch in my direction is reflected off of me, returns to its original trajectory and adheres to you."
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post #4 of 6 (permalink) Old 01-18-11, 11:23 AM
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Re: Code P-0171 / P-0174

With the problem running when cold , might be worth checking engine cooling temp sensor .
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post #5 of 6 (permalink) Old 01-19-11, 03:01 AM Thread Starter
97 Explorer 4x4 4.0L SOHC
 
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Location: Salem, Oregon
Posts: 17
Re: Code P-0171 / P-0174

Where, exactly, is the engine cooling temp sensor? By the way, the temp of the engine is good when warmed up. It stays just below mid-way up on the gauge.


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post #6 of 6 (permalink) Old 03-23-16, 07:28 PM
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Re: Code P-0171 / P-0174

My 99 Windstar-PO174 TOO LEAN BANK 2. Changed AIC, EGR, DPFE, INTAKE GASKETS, & MAF. CEL is still ON. My next step is replace all O2 sensors. Any feedbacks? Thank you.
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