CBB9M
23 year Ranger veteran
Joined: Sun Oct 22nd, 2017
Posts: 371
Reputation Points: $user_rep
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I can't remember what MY your Ranger is, but anyway, I went and looked in the FSM for an 04 and unfortunately there is no C1939 listed nor is there a symptom that is similar to you've described. Went digging for info on that DTC and (probably) found that same post on the warped rotor but there was no final fix and conclusion. I did come across a couple references to the switch mounted on the MC, but this is where the MY of vehicle may have mattered. RE the axle cover and fluid, realizing that the tone ring and sensor generate a square wave and it's the location/relationship between these two parts that matters, and this isn't user adjustable, I wouldn't expect that the cover and especially the oil could impact operation. I do recall over the years that there is some history of 93ish through late 90's Rangers having sensors go bad in the rear axle, and although they wouldn't trigger the CEL another symptom was prestent, could be odd shifting, could be RABS light came on, and IIRC sometimes the CC was acting up, and when this was the case the only way to confirm the sensor was bad was to do what you and I hate......throw a new part at it (hey, at least it's an educated guess). So with that said and seeing how many different sensors you've been through (and if your MY even applies), it's probably safe to rule that one out.
May not have an answer but I've got a few ?'s
* what MY?
* ABS or RABS?
* when the light comes on do you have your foot on the brake or are you just rolling along and out of nowhere, on comes the light?
* I read the OP but.....do you recall any connection between when this began and any work you did soon before that?
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-Bill
04 Ranger FX4 Level II, several mods
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