MustangWorks.com : Ford Forums - View Single Post - checked for koer codes and heres what I got

PKRWUD · 12-17-2001, 03:04 AM

I know I already answered this, but here goes: For your car, a KOER code 91 has only one definition: Your left O2 sensor is telling the ECM that your running lean. This can be caused by many things, but since you're not getting a code 41, that means it's either a problem with cylinders 5-8 or the O2 sensor itself.

Take care,
-Chris

12-17-2001, 03:04 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I know I already answered this, but here goes: For your car, a KOER code 91 has only one definition: Your left O2 sensor is telling the ECM that your running lean. This can be caused by many things, but since you're not getting a code 41, that means it's either a problem with cylinders 5-8 or the O2 sensor itself. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!