Can someone please tell me what code 11 is on a 1989 ford ranger xlt w/ the 2.9l v6? I can’t really find anything on google except one place says “system checks ok” whatever that means.

thanks

 

That's what it means, computer does a Self Test each time its powered up
Code 11 means no faults were found and no other codes to display

2 digit Ford code list here: https://www.therangerstation.com/tec...it-ford-codes/

No "P" is used or "0"s for 2 digit or 3 digit Ford Codes
3 digit codes started in 1993, previous years were 2 digit

The code system is called OBD(on-board-diagnostics)
In 1996 US/Canadian Law Required ALL new vehicles sold in the US or Canada to use OBDII(OBD2), so at that time the older system was renamed OBD"1"

OBD2 uses 4 digit codes, and for engine/transmission codes it will have a "P", like P0172, or P1000, P stands for Powertrain code
P0100 to P0804 are generic codes, so from Audi to Winnebago, these codes mean the same thing
P1xxx, P2xxx are Manufacturer specific codes, so same code on a Ford or VW can mean different things

There are also "B" codes, Body codes, from Body Computer, GEM or SJB in Rangers
Also "C" codes, Chassis codes, for RABS and 4WABS
And "U" codes for data network communications issues

OBD2 is still required by Law in 2022 vehicles
Rangers got OBD2 in 1995 but had issues, lol, so 1996 is the first official OBD2 compliant system

 

Why would the truck only through the light when it’s floored? Also if that code is on when they smog it won’t the truck fail then and there?

thanks

 

If CEL(check engine light) Flashes when engine has a higher Load(floored) then that means you have Misfires, so "back off the throttle"
That can set codes if Misfires repeat enough times

No, truck won't fail because the CEL is NOT on when testing

Truck can fail if emissions are high, but not because computer "self test" is OK
Code 11 doesn't turn on the CEL, because its not actually there in regular use/driving
Its only there when you connect OBD jumper and run "self test" again