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vehicle speed sensor on 1991 Volvo 740

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
were is the vehicle speed sensor for a 91 volvo 740 and whats the difference between the front and back sensors
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(2) Comments
What issue are trying to fix? ABS or speedometer?
Speedo uses the rear differential sensor and the ABS uses the rear differential sensor and front wheel speed sensors.
I would check the ABS codes, and check that rear differential sensor and wiring. If yo look at the back of the differential you'll see the sensor with 2 wires going to it.