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Read articles →A farmer-filmed DIY walkthrough of replacing the speed sensor on a Massey Ferguson 1840M after it repeatedly dropped into limp mode. Covers symptom diagnosis, part identification, access panel removal, sensor swap steps with bolt sizes and reassembly tips, and costs $140 in parts versus an estimated $600 dealer visit. Worth noting: the speed sensor turned out not to be the root cause, an oil pressure sensor was, making this most useful to owners troubleshooting similar symptoms who want to rule out the speed sensor themselves.
An owner-operator on a working farm sharing unscripted, learn-as-I-go repair experience with no professional mechanic background, by his own admission.
The farmer diagnosed it as a bad speed sensor based on the fault code, confirmed by the dealership, though it turned out to actually be a failing oil pressure sensor.
Remove the wiring harness panel, unclip the connector, remove the small mounting bolt, pull the sensor out carefully since it is compression fit with a rubber O-ring, then reverse the steps.
The part cost $140 compared to an estimated $600 for a dealer visit.
The code was 0100 on the top bar and 01 in the middle, which indicates the oil pressure sensor near the oil filter, not the speed sensor.
