Error Codes 41 and 91 KOEO Test - Ford Mustang Forums : Mustang Forum
Go Back   Ford Mustang Forums : Mustang Forum > Windsor Tech Forums > 5.0/5.8 Engine Tech is the premier Ford Mustang Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 03-31-2004, 05:40 PM   #1
Registered User
MotleyDrew's Avatar

Trader Feedback: (0)
Join Date: Sep 2003
Location: Ottawa Canada
Posts: 315

Question Error Codes 41 and 91 KOEO Test

I have noticed my engine light comming on for a while now.

I believe these are the codes I recieved. I tested with key on engine off and after getting the 11 code it proceeded to give me the 41 and 91 code which not a valid KOEO code but it is a valid Key on engine on code which means a lean condition in bank 1 and 2.

I have a brand new gt40 motor, new O2 sensors, new 24 injectors, new SC Trim, new everything and timing is at 10.

Does any one know what I need to do to make sure I can get rid of these codes?

please help

Rock N Roll
11.633 @ 119.003 mph 1.657 60ft

1993 coupe Blown

2001 Z06 Blown
MotleyDrew is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forums : Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
You MUST put your location in your profile. Any other text will be removed and you will have your ability to edit your profile removed as well.
Please select your insurance company (Optional)
Date of Birth
Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.
Month Day Year


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 01:10 PM.

Powered by vBulletin® Copyright ©2000 - 2015, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.5.2
© 2010-2011

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.