Volvo S40 Questions

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the thermostat seems to work fine i have lots of heat ,i didn't know a LOW temp coolant would trigger a code could this be a sensor ?? any tips ,please and thank you
Timing belt cameoffwhilr driving
Lost power pullled over and towed
windows, or cental locking.
and reset lite
There are no OBD codes as I have fixed and gotten rid of all the codes that came up. I replaced the timing belt and accessories and timing is dead on, starter is good, alternator is good, battery is good, fuel system is good, replaced many sensors and cleared many codes. Cleared: P0017, P0102, P0122, P0302, P0304, P0314, P0335, P0341, P0351, P0365, P0366, and a few more I had on another list I can't find. The only one I haven't cleared is P0650. Help please because this is our only car and it has been down for 3 weeks now and my wife is chronically ill and I have to be able to take her to her doctor's appointments and for her tests and we have been having to reschedule so I can try to fix this car. Thanks!
My brother brought me his s40 and said it has no reverse and wanted me to check it out. I opened up the trans and it smelled like gear oil so I asked him about it and he said he put gear oil in the front differential. WTF! I explained to him how this transaxle works and he said woops. I rebuilt the valve body and replaced two solenoids that were bad, flushed it out and replaced the fluid. The car was now trying to go into reverse, so I put it through the gears and kept checking the fluid until it was full and tried again. I put it in drive and it worked fine, I put it in reverse and the rpms dropped but would not move, except for a feeble attempt. I put it in park checked the fluid, put in in reverse and it went forward, not backward. It now has no drive, only goes forward in reverse. How do I trouble shoot the the computer and the gear selector to find the problem. The problem isn't the cable.
Happened once
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