@howardc64 can one remove the speed sensor fully without disconnecting the cable? how much slack is on the cable one the sensor is out? minimal or enough to see inside the orifice? I'd rather not break the clip and if i can take it out of the housing altogether, sounds like that is the way to go.
Getting under this car is not so easy. Am a descent auto DIYer but dreaded safely jacking it up to check the speed sensor for awhile. Here is a complete write up.
Sweep the floor
If not using a lift, will likely be laying on the floor. Head will rest on ground often... hopefully not on uncomfortable pebbles/rocks
Raise the car
Drive up shallow ramps is my favorite method with tires raise about 5+ inches. Will provide enough clearance but not all that comfortable
Necessary tools
Gather these to avoid multiple trips crawling out from under the rear end.
- Electric driver with 10mm socket is a great help with a bunch of 10mm to remove
- Plastic clip prying tool (or thin + wider flat head screwdriver)
- work light(s) standing ones are bright but get in the way often as you work on both sides. A light that doesn't roll is helpful working on the floor.
- 10mm wrench to loosen/tighten speed sensor bolt
- Silicone lubricant - finger apply a drop on the speed sensor o-ring before re-install (probably no necessary)
- thin and thicker flat head to wiggle / leverage out the speed sensor
- Card board to lay on
Clearance
Mid Aero Shield Removal
Remove all 4 strakes. Tip, leave middle screw/bolt in last and install it first on reinstall on the strakes so with 1 screw, strake will hang leveled rather an dangle one end on the floor without much space.
Remove all bolts, screws and plastic clips per https://teslamotorsclub.com/tmc/attachments/rear_undertray_and_diffuser-mi00-jpg.894912/ Note diagram is annotated with fewer bolt/screw installs for quicker subsequent removal
Speed Sensor Location
On the drive unit facing the driver side tire.
Remove Speed Sensor
- No need to remove connector (I worry it could break given amount of force required)
- Remove 10mm bolt
- Use thin followed by thicker flat head to wiggle/lever (in multiple spots) out the speed sensor. Avoid going in too deep and damage the o-ring
- Can pull speed sensor all the way out of the hole
If coolant seal is leaking, it will show droplets on the speed sensor. No need to look inside the hole.
Have your service center check large rear drive unit for coolant leakage before warranty expires
The models with dual drive units have fewer problems because the workload is shared. Do you know this as a fact and have any evidence or just an assumption because it sounds logical?
teslamotorsclub.com
Can use a drop of silicone lubricant (or any rubber safe lubricant I suppose) around the o-ring to reinstall. Probably not necessary.
LDU Revision
Mine had a sticker on bottom. To decode it, see here
Tesla LDU - Revisions
Many Revisions Tesla has had many version of the LDU and most cars were getting LDUs replaces every few 10k miles with regularity. My 2013 MS has had the original (don't know Rev) to Rev K and then onto Rev Q all in 40k miles. There are some differences between all these Revs. Following is not a
sites.google.com
Last edited: