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Performance Upgrades - Maintenance - Modifications - Problem Solving. Covering the Explorer, ST, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar.
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...
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,
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...
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...
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...