DTC P0171 Fuel Trim System Lean Bank 1 and P0174

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Aug 30, 2006 | 04:57 PM

zakash23

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Joined: Aug 2006

Posts: 1

DTC P0171 Fuel Trim System Lean Bank 1 and P0174

I detected both of those codes using the ODB II system, what do they mean? is it a serious problem, what action may I take to fix this?

Aug 30, 2006 | 05:13 PM

2001NBMZ28

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Joined: Jul 2001

Posts: 1,655

From: Jacksonville, FL

Re: DTC P0171 Fuel Trim System Lean Bank 1 and P0174

Vacuum leak maybe??? Visit gearchatter.com to look them up...and welcome aboard.

Aug 31, 2006 | 12:12 AM

AL SS590 M6

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Joined: Jul 1998

Posts: 6,247

From: Charlotte,MI USA

Re: DTC P0171 Fuel Trim System Lean Bank 1 and P0174

It means that both banks have gone so lean that the computer can not compensate for it. Have you had the air tract off lately? I would guess that the bellows isn't on the bottom of the throttle body right.

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