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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-16-2009, 11:21 PM   #1
lx5.0
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Default koeo codes

i ran a test to see what codes i would get and this is what i got
31 - EGR Valve Position/Pressure Feedback EGR Circuit Below Minimum Voltage. 0.24 volts (O,CM,R)
81 - Secondary Air Diverter Circuit Failure (O)
82 - Secondary Air Bypass Circuit Failure (O)
84 - EGR Vacuum Regulator (EVR) Control Circuit Failure (O)
85 - CANP Circuit Failure (O
are these codes my emissions stuff cause ive deleted them i dont know about code 81 and 82 is that emissions also
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Old 03-17-2009, 01:55 AM   #2
94ford5liter
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Pretty sure those are all smog related, dealing with what you removed. Did you remove the egr as well? Cause I think that first code is a bad a egr sensor otherwise.
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Old 03-17-2009, 06:39 AM   #3
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81, 82 and 84 are for the three solenoids behind the RH side strut tower being disconnected/missing.

85 is for the CANister Purge solenoid being disconnected/removed.

31 is for the EGR sensor being disconnected/removed.

In your setup, it's the equivalent of a "system pass".
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Old 03-17-2009, 12:44 PM   #4
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Could you give me a little help with my codes?
111-pass code? what is a pass code?

165?

536-Brake on/off....replaced it

Thank You
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Old 03-17-2009, 01:22 PM   #5
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111 - no fault codes registered for that self test routine.

165 - no clue, it doesn't show as a valid KOEO or KOER self test code

536 - Brake On/Off circuit failure / switch not actuated during KOER test

If the fault code was logged during a KOER, it means you forgot to press the brake pedal after the engine ID code was displayed (4 = 8 cylinders engine), not that the switch was at fault...... LUK.
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Old 03-17-2009, 08:15 PM   #6
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Thank you for the help! Should I reset the computer ? I'm going out now to clean the MAF and change plugs. and test drive....I hope it isn't the fuel pump!
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Old 03-17-2009, 08:15 PM
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