99 Expedition Rear Wheel Sensor
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99 Expedition Rear Wheel Sensor
Ok I have figured out that I'm having a problem with my rear wheel speed sensor on my 99 expedition 4x4. I was just wondering if anyone could give me some details on how to replace it. My local mechanic wants 1000 to do it. The part is only 20$ and I'm sure I can fix it myself.
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Really simple, like above posts it is on top of the diff, remove the hold down. Most have a bracket with parking brake cable. Use a screwdriver and small hammer to hit the tab and make the sensor twist, work it back and forth carefully while prying up gently. If it happens to break off, remove the rear cover and push it up and out. A good practice is to go ahead and service the fluid anyway, heat kills the magnet, and breaks down your additives.
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Ok so i changed the sensor and it did not fix my problem....I'm alittle upset now. My rear end makes a low grinding sound and it feels like one of the rear wheels are locking up. I have to get it above 40mph for it to "catch up". Anyone have any ideas?
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You have a wheel bearing trying to seize. Raise the rear end and rotate the tire by hand, you should be able to feel and hear the problem. Have you inspected your brakes? Maybe something in the parking brake is coming loose.
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Ok I will have to check that. The locking up doesnt seem as rough since i changed the sensor. I will say this is my first 4x4 so i'm tryin to learn all I can. After it "catches up" the 4x4 light on my dash blinks. Had a friend run a diagnostic test and the codes C1107 and P1834 came back. Just want to get this thing fixed. Wife is getting close to due date and I really dont want to be without a truck to carry my new son home in.
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Post original symptoms. Sounds to me like you are describing a normal track lok clutch pack responding to a difference in tire diameter. Check pressures and then measure actual tire height. They must be within 1/8 inch or you will feel the clutches engage and disengage because of difference in wheel speed.
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Ok A mechanic ran a diagnostic on my 1999 Expedition. It came back with the code C1107. The reason I took it to get checked out is because it will make a low grinding sound and then a pop. The grinding sound goes away once I hit 40 mph then my 4x4 light on my dash will start to blink. I thought it may have been the rear wheel sensor so I replaced it and that did nothing to help. It sounds like it is coming from the front now. Before I replaced the rear sensor I could feel something in the gas pedal. Now I dont. Hopefully I've given enough info. This is very confusing because I've done research and it comes back to the wheel sensors.
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I agree with jdecker, wheel speed sensor will turn on ABS lamp. you need a lift so you can run it up and listen to the source of the noise, don't try jacking up the back because 4wheel may be engaged at all time.
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I am having what sounds like the same problem as this guy. What I think he is noticing is that the vehicle is starting in 4wd every time the car is started, then when it gets to around 40mph the dash light begins to blink and it pops into 2wd, then it stays in 2wd for the rest of that trip. By the way, this all happens on the A4wd selection. My 4x4 h+L both work normally. Just when you have it in A4wd it always starts out with all 4 wheels spinning. Anybody think what the issue is/could be?
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It monitors speed sensors on all 4 wheels, if one is reading higher than the others, it assumes that wheel is spinning and locks 4 wheel to gain traction. One tire larger in diameter could be the culprit. Check tire pressure, measure the height, worn tires on one or another corner can be as much as 1/2 inch shorter than one with less wear. The flashing light is a clue that the condition did not correct itself and needs attention, driving with continously slipping or different size tires will damage the viscous clutch in the transfer case.