If you replaced the sensor and there is no change, before spending any more money, have the can-bus scanned for codes. CAN stands for controller area network. Basically, all the different computers/modules are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing them.
Here is a link showing how it is done:
Let me know if this is something you can have done. I can understand the shifting issue if the OD light is flashing, but the 4lo is interesting.
Let me know.
Tuesday, March 22nd, 2022 AT 9:16 PM