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Jeremy, Certified Diesel Technician/Electrician
Category: Ford
Satisfied Customers: 2723
Experience:  ASE, NATEF Engines and Electrical certified, EPA 608/609
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Diagnostic codes ford F150 Lariet KOEO 33 41 95/33 41 95

Customer Question

diagnostic codes for 1988
ford F150 Lariet KOEO 33 41 95/33 41 95 Koer 42 33 77. What do these codes mean?
Submitted: 7 months ago.
Category: Ford
Expert:  Jeremy replied 7 months ago.

My name is ***** ***** I will assist you with your question today.

I'm an independent contractor and I don't get paid until a rating has been made. No rate, site gets it all.

We can go back and forth as needed to help resolve the issue you are having. Follow ups are free after ratings, so rate in confidence!

See your code meaning below as requested.


M is Memory code




ALL – EGR did not open/ respond during test or if memory code, did not open intermittently – EVP EVR PFE



System lean – Fuel control


System was lean for 15 seconds or more (no HO2S switching) – Fuel control



Fuel pump: open, bad ground or always on – Power / Fuel Pump Circuits


AIR not Diverting (AIRD) – Air Injection


Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) – Power / Fuel Pump Circuits



System rich – Fuel control


System was rich for 15 seconds or more (no HO2S switching) – Fuel control


System did not receive “goose” test – see TESTS


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Expert:  Jeremy replied 6 months ago.

Do you still need assistance with this?