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my spedomiter sometimes works and sometimes doesnt work on 1998 Plymouth Neon

check engine lite on and thw coder readout is po743 i looked up what that code meant and found out its the torque converter clutch circuit electrical. how do i fix. ive been told i might have to replace the thrasher cable? but who knows

Asked by for the 1998 Plymouth Neon
Have the transmission serviced and the vehicle speed sensor along with the torque converter lockup solenoid checked and replaced as needed.
Not a diy repair.