3.0 MIL light

[fredlp]

Hello Fella's,
I am new to this site, I have a problem with my 1991 Ranger 3.0 2wd.
The problem is I get a code 41 and can not figure what it is, so far I have changed the fuel filter and ECT, I do not want to keep throwing parts at it, has anyonne else ran accross this, any help would be appreciated.
Thanks Fred

 

[modelageek]

code 41= lean condition, any other symptoms, any maintenance done recently, did you check your air filter that it is not leaking any where , can you do a fuel pressure test, did you check for vacuum leaks with some carb cleaner