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Hey everyone....new here. Having an issue with my ABS/ESP with my 2011 Mercedes C300 4matic. Im getting this Right Rear speed implausible error and its shutting down all things related like ESP/ABS/Run flat...etc. Scanned the car and its pointing to a bad ABS sensor or reluctor ring. Changed both of those already and did not fix anything.
Did a live graph with my scanner and it gave me this results. As you guys can see...the right rear corner is sending erratic signals based on the graph shown. All the other corners are pretty much bang on and has the same data.
The graph is cut off along the bottom. Any way to get rid of that bottom banner to see the full graph? Are there more spikes we cant see on that graph?
What do the numbers on the left column indicate, what do the numbers along the bottom indicate?
All the sensors appear to be reading similar except the spikes on the Right Rear. First thing that comes to mind is something happened with the ring, either magnets damaged, rust still in the hub. Or could be a loose wire or connection.
Could try swapping rear sensors around, see if the problem moves.
RR wheel speed peaks greater than the other wheels
RR wheel speed signal has dropouts
Possible cause: bad wire Action: Check wiring for fraying or rodent damage. Repair if found. Reason: The drop-outs and speed mismatch may be due to shorts in the wiring. If there is damage to the insulation, you could be intermittently shorting to chassis.
I just noticed that all your codes are STORED. If you still had a problem, they would show CURRENT. You need to clear them and retest (i.e., test drive then check for codes).
I just noticed that all your codes are STORED. If you still had a problem, they would show CURRENT. You need to clear them and retest (i.e., test drive then check for codes).
Yes...I've cleared them and it will be fine for a bit like about 1km or so and they will all come back after.
RR wheel speed peaks greater than the other wheels
RR wheel speed signal has dropouts
Possible cause: bad wire Action: Check wiring for fraying or rodent damage. Repair if found. Reason: The drop-outs and speed mismatch may be due to shorts in the wiring. If there is damage to the insulation, you could be intermittently shorting to chassis.
The ABS sensor wires are all good as its a new sensor. Checked the wire harness that plugs to the ESP module and they are all good as well.
Will a bad fuse or relay cause this issue? If so which fuses/relays should I check? Will a bad wheel bearing also cause this issue?
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