the first is a trans control system malfunction and the 2nd code(0740) is tcc circuit malfunction- but what exactly do these codes mean? and the o2 sensor needs to be replaced, it said bank 1 sensor 1- does that mean the one BEFORE the catayltic converter? thanks

P0700 is a catch all code telling you there is something wrong in the transmission"s electronic controls. Many times that is the only code that pops up making it difficult to determine what's up. Thank your lucky stars you have a second, much more revealing code. The P0740 is telling you there is a problem in the circuit that controls the torque converter in the transmission. The cause could be anything from the transmission control module to wiring to a bad torque converter solenoid. Could be as simple as a loose or corroded connection or broken wire.

Yes that's the O2 sensor forward of the cat converter.

Something you need to type into about every thread you make is the engine size and transmission type. Whatchya got?

thanks, i'll take it to a transmission shop. and sorry, i forgot about the make and model. it's a 2001 chrysler town & country lxi, 3.8L v6, all wheel drive, 4-speed auto with od.