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O/D light flashing, lots of posts no resolutions
I have a 94' F250. After reading lots of threads i have discovered that many people have the same issue as me. Occasionally my O/D light will flash, giving me Very harsh shifts. I can restart the truck and the issues will go away. When the light is not flashing the truck drives perfect. I have no other trouble lights, and all gauges work correctly. I have a list of codes pulled from the truck. I changed the Throttle Position Sensor a couple weeks ago with no luck. I am still getting the codes, and the problems.
Here are the codes,
23: Throttle sensor out of range or throttle set too high - TPS
43: (R)HO2S sensor not reading (run at 2000 rpm's for 2 minutes and retest - check for HO2S switching)
(M) Was lean at WOT for 3 seconds or more - Fuel control
63: Throttle Position Sensor (TPS) signal too low TPS
99: (R) ISC needs to learn (Let idle for 2 minutes, Erase memory and retest)
Transmission EPC circuit/solenoid failure - Transmissions
I am kind of thinking its a ground issue or something along those lines. Don't really know where to start. I do not know what the HO2S Sensor is either, so any guidance on that would be awesome as well.
Thanks in advance.