The vehicle is a 2003 Nissan Sentra, 1.8liter engine, over 100,000 miles.
Did you test electrical circuit's before replacing the sensors ? Do you know how they work , where battery voltage comes from ? May only be 5 volt ref. voltage from the transmission control module .
DTC P0720 VEHICLE SPEED SENSOR·A/T (REVOLUTION SENSOR) Revision: May 2004 2003 Sentra TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND GROUND Diagnostic Procedure ECS005X0 1. CHECK INPUT SIGNAL (WITH CONSULT-II) With CONSULT-II 1. Start engine. 2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II. 3. Read out the value of "VHCL/S SE·A/T" while driving. Check the value changes according to driving speed. OK or NG OK >> GO TO 3. NG >> GO TO 2. 2. CHECK REVOLUTION SENSOR (WITH CONSULT-II) With CONSULT-II 1. Start engine. - Check harness for short or open between TCM, ECM and revolution sensor. Refer to AT-129, "Wiring Diagram - AT - VSSA/T" . - Check harness for short or open between ignition switch and revolution sensor. OK or NG OK >> GO TO 3. NG >> Repair or replace damaged parts. TERMINAL WIRE COLOR ITEM CONDITION DATA (DC) 10 BR/R POWER SOURCE WHEN TURNING IGNITION SWITCH TO "ON" BATTERY VOLTAGE WHEN TURNING IGNITION SWITCH TO "OFF" 0V 29 W REVOLUTION SENSOR WHEN MOVING AT 20 KM/H (12 MPH). USE CONSULT-II PULSE FREQUENCY MEASURING FUNCTION 150 Hz 42 B/W THROTTLE POSITION SENSOR (GROUND) - 0V
https://www.nicoclub.com/FSM/Sentra/2003_Sentra/at.pdf
Look it up in factory service repair manual
SOURCE: 2000 nissan sentra gxe code output speed sensor
It sounds like the transmission is slipping and the sensor is just reporting this info and setting a code, you have made a common mistake. You likely need a transmission overhaul
SOURCE: my 2001 nissan sentra gxe gave a code p0720. what can I do?
P0734 output speed sensor not reading correctly.
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