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I replaced the left wheel speed sensor with OEM merc part and this code came up again. I don’t know what’s causing the issue , maybe faulty fuse? Any recommendation on things I should check?
On the 4matic the magnetic rings are in the wheel bearings. Have to replace the bearing, if that is the issue.
Just to be clear you installed a Genuine Mercedes wheel speed sensor? I ask because "OEM" can be a brand that does not specifically make the original part though they make other parts used in Mercedes. OE would be Original Equipment, the one who originally made the part.
You say "this code" came up again. Do you mean after you replaced the wheel speed sensor and erased the fault codes you are now seeing ALL those codes?
To rule out the new wheel speed sensor you can always swap the right for the left and see if that moves the issue or it stays the same.
Photo below is what it looks like in the wheel carrier. Red lines indicate where the wheel speed sensor sticks down. Gets its readings off the surface of the wheel bearing. This was taken when I worked on my cv axles. Can see bits of rust that collects in there. That may be an issue.
On the 4matic the magnetic rings are in the wheel bearings. Have to replace the bearing, if that is the issue.
Just to be clear you installed a Genuine Mercedes wheel speed sensor? I ask because "OEM" can be a brand that does not specifically make the original part though they make other parts used in Mercedes. OE would be Original Equipment, the one who originally made the part.
You say "this code" came up again. Do you mean after you replaced the wheel speed sensor and erased the fault codes you are now seeing ALL those codes?
To rule out the new wheel speed sensor you can always swap the right for the left and see if that moves the issue or it stays the same.
Photo below is what it looks like in the wheel carrier. Red lines indicate where the wheel speed sensor sticks down. Gets its readings off the surface of the wheel bearing. This was taken when I worked on my cv axles. Can see bits of rust that collects in there. That may be an issue.
yes OE sensor , sorry. Genuine Mercedes part. Yes replaced and cleared codes , codes came back. Oh so I can’t just single change the ABS ring , I have to change the whole bearing ? Damn I rlly thought I could just change the ABS ring . How can I clean it properly , I want to test if I could before I change the whole bearing itself
On RWD models the abs ring is in the sealing ring:
On the 4matic it is in the wheel bearing. This is common on other 4-wheel drive vehicles:
In the fault codes im focusing on the word "implausible". Which to me means the readings arent within spec/what the car thinks it should be but its still seeing a reading. I have never personally working on abs issues other than simply removing/reinstalling the sensor which working on the axles.
Lets see what we can find on those specific fault codes:
Not finding much. I would start by using your scanner to see what that wheel speed sensor is reading, if anything. Have you checked to see if is at least functioning, showing any speed? Even though your scanner is showing "signal was not received" the specific fault code in the manual is saying "implausible".
I have my doubts that the issue is with the wheel bearing. Mines a New England car, axles are extremely rusty and my bearings looked fine.
So use your scanner and see if you are at least seeing the sensor picking up any reading. I would look to make sure the sensor wire was routed back correctly, isnt stretched or damaged. Remove the sensor from the wheel carrier and clean out the hole, use a q-tip and isopropyl alcohol.
I never did it but I have seen ways to test the sensor itself. Use a multimeter and connect it to the sensor connector, rotate the hub and see if you see any readings. It will be low voltage.
On RWD models the abs ring is in the sealing ring:
On the 4matic it is in the wheel bearing. This is common on other 4-wheel drive vehicles:
In the fault codes im focusing on the word "implausible". Which to me means the readings arent within spec/what the car thinks it should be but its still seeing a reading. I have never personally working on abs issues other than simply removing/reinstalling the sensor which working on the axles.
Lets see what we can find on those specific fault codes:
Not finding much. I would start by using your scanner to see what that wheel speed sensor is reading, if anything. Have you checked to see if is at least functioning, showing any speed? Even though your scanner is showing "signal was not received" the specific fault code in the manual is saying "implausible".
I have my doubts that the issue is with the wheel bearing. Mines a New England car, axles are extremely rusty and my bearings looked fine.
So use your scanner and see if you are at least seeing the sensor picking up any reading. I would look to make sure the sensor wire was routed back correctly, isnt stretched or damaged. Remove the sensor from the wheel carrier and clean out the hole, use a q-tip and isopropyl alcohol.
I never did it but I have seen ways to test the sensor itself. Use a multimeter and connect it to the sensor connector, rotate the hub and see if you see any readings. It will be low voltage.
I have checked the sensor , it says it’s connected and giving volts . So I think there’s no issue with the sensor . It’s just not reading the speed , which makes me think if it’s blocked or dirty or cracked . I have bought a new speed sensor and the codes went away for a week and then it comes back . Nd now I’m thinking if I have a cracked ABS ring or a faulty fuse .
There is no single fuse that would effect just the one wheel speed sensor.
So when you hook up your scanner and go to the settings to see each sensors wheel speed it is showing its working but the value does not change when the wheel is spun?
if you think the sensor is functioning properly then I would try cleaning the bearing, maybe theres some debris in there. See what it looks like. Its fairly simple to do.
- Remove axle bolt.
- Move brake caliper up out of the way.
- Unbolt the bottom of the strut from the wheel carrier.
- Remove wheel speed sensor from wheel carrier.
- Tap cv axle in, out of the hub.
- Tilt top of wheel carrier outwards.
Then you should be able to get inside there and see the condition of the bearing and clean it out.
There is no single fuse that would effect just the one wheel speed sensor.
So when you hook up your scanner and go to the settings to see each sensors wheel speed it is showing its working but the value does not change when the wheel is spun?
if you think the sensor is functioning properly then I would try cleaning the bearing, maybe theres some debris in there. See what it looks like. Its fairly simple to do.
- Remove axle bolt.
- Move brake caliper up out of the way.
- Unbolt the bottom of the strut from the wheel carrier.
- Remove wheel speed sensor from wheel carrier.
- Tap cv axle in, out of the hub.
- Tilt top of wheel carrier outwards.
Then you should be able to get inside there and see the condition of the bearing and clean it out.
Heres a crazy idea to see if it is the bearing and not with the sensor/wiring.
Hopefully you saved the old sensor. Cut the connector off and splice on some 16 gauge wire long enough to reach to the passenger wheel. Then you have the left side sensor in the right wheel. Use your scanner and spin the wheel/rotor and see if its working and reading the wheel speed. If it is reading properly then you know the issue is with the bearing.
Heres a crazy idea to see if it is the bearing and not with the sensor/wiring.
Hopefully you saved the old sensor. Cut the connector off and splice on some 16 gauge wire long enough to reach to the passenger wheel. Then you have the left side sensor in the right wheel. Use your scanner and spin the wheel/rotor and see if its working and reading the wheel speed. If it is reading properly then you know the issue is with the bearing.
I can replace just the bearing correct? Or would I have to replace bearing and hub ?
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