codes 411 and 412

[silverclaw328]

I have a 1994 ranger 4.0L and recently using a genysis scan tool I ran a KOER test and received two codes.

411
412

What do these codes mean and how do I go about fixing the problem if any?

The truck seems to be running ok, just trying to keep it in good working order.

 

[RonD]

Good link here for Codes:
http://www.therangerstation.com/tech_library/OBD-II_codes.html


Both 411 and 412 are about Secondary Air, which = emission system, so smog pump or exhaust back flow for reduced emissions.
Read here:
http://www.obd-codes.com/p0411

 

[silverclaw328]

Thank you for the reply. Unfortunately my truck is a 1994 and doesn't have OBD II. Instead it has EEC-IV diagnostics system. I assume the codes from the two systems are not interchangeable???

 

[SenorNoob]

In that case look here: http://www.therangerstation.com/tech_library/3digitcodes.html

411 and 412 both deal with idle speed. I'd take a look around the IAC.

This should help. http://oldfuelinjection.com/index.php?p=39