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Update : After getting wiring schematic from arco777 I proceeded to check wiring from sensors to ECU. Wiring good. I pulled the ECU from its mounting and had to open it up and look inside to see if anything on the board was burnt. Sure enough there was a burnt diode , so I traced out the circuit...

Thanks Arco777 that's just what I was looking for.

Ok so I pulled the plugs and inspected. Due to the fact that they are new and not many miles were put on them -- they look good, No black. The 137 code keeps coming back and sometimes the MAF code koeo & Koer. The funny thing about it is sometimes it will run great and other times when pushing...

Thanks Mrshorty, I have read a lot of your posts and you seem versed in drivability issues. I will pull the plugs and check that.. Thanks for your input. :thumbsup:

It started to run bad and light came on. After I replaced both O2sensors it seems to run better but after 10 miles the check eng light came back on with code 137 koer. I have checked the wiring from o2 vehicle conector back to ECM and it checks good. I need to find out info about looking at...

Hey guys, Interesting forum lots of great info. 1994 Ford Ranger 4.0 I was wondering if a converter would cause a repeated code 137 ? (HEGO sensor rich) I got that code KOER -- I have replaced both O2 sensors and MAF. The MAF fault was repaired with MAF replacement. I was reading some...