Left Bank Lean Error code

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Nov 12, 2009 | 07:27 AM

psu1xj

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Joined: Aug 2004

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Left Bank Lean Error code

Hi guys!

While picking my '01 F150 (4.2/M5OD) up after inspection last night I got a service engine soon light.

It's telling me "Left Bank Lean -- 0174"

What should I look at first?

Thanks!

-Sam

Nov 15, 2009 | 03:15 AM

bokker

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Joined: Mar 2005

Posts: 352

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From: uk

hi, first thing i would look for is a vacuum leak, bokker.

Nov 16, 2009 | 08:14 AM

BrianA

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Joined: Aug 2001

Posts: 4,532

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From: Trussville, Alabama

+1 look for a vacuum leak first. Most simple and I believe most common.

Here is a little more info:

https://www.ford-trucks.com/forums/8...-too-lean.html

Ford P0171 & P0174 Lean Codes

Best of luck and let us know what you find.