Left bank lean code?

Medster · #1 (**permalink**) 01-08-2005, 07:45 PM

I have a question here. Got a left bank lean code? What the heck does this mean? I have no clue I just changed both O2s. Thanks Greg

Rockledge · #2 (**permalink**) 01-09-2005, 11:18 AM

What code number is it? Year?

Medster · #3 (**permalink**) 01-09-2005, 12:36 PM

I'll have to check it again I didn't get a number. My buddy has a snap on code reader and all i remember is it saying left bank lean and thought what the? It's a 93 ranger 3.0 Thanks Greg

johncfox · #4 (**permalink**) 01-09-2005, 03:44 PM

Yeah mines coming up with the same code, code #41. Mines a '90 model though. I replaced the O2 and it still persists. Any clues.

Medster · #5 (**permalink**) 01-09-2005, 04:39 PM

41 (R) System lean - Fuel control
(M) System was lean for 15 seconds or more (no HO2S switching) - Fuel control

Rockledge · #6 (**permalink**) 01-09-2005, 06:42 PM

If you are confident that the 02 circuits are OK, that there is no corrosion going on and the connections are secure, then it's not the 02 sensor that is causing the code. Instead, the engine is running lean.

Lean = too much air getting into the combustion chambers and/or not enough fuel. Common causes of too much air are vacuum leaks (i.e., disconnected or deteriorated hoses, PCV & EVAP system leaks, intake gasket leaks) and fuel delivery issues (i.e., clogged fuel filter, bad injector(s), faulty fuel pump).

A thorough examination of the engine bay for vacuum leaks is in order. And a great place to start regarding possible fuel issues is a new fuel filter (if not replaced in a while) and a fuel pressure check:

http://members.aol.com/racsan99x/Fue...ureTesting.doc

Medster · #7 (**permalink**) 01-10-2005, 06:05 AM

Fixed!!!! Just put in six new fuel injectors and it runs like a new truck. Once again I want to thank everyone. Greg