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Old 03-02-2015, 01:04 PM
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Level Sensors in need of replacement? Low Voltage on 2

Had the pleasure of trying to sort out my SLS mystery for the last year. Think I'm getting closer but still not there.

Replaced the battery and rebuilt the compressor a couple weeks ago. Now the Tire Pressure light (yellow) and SLS error are on constantly. Cannot clear with GT1, INPA, BMW Scanner. I see no mention of any error code related to the tire pressure light and am unable to reset it by holding it down and/or by driving.

Compressor rebuild took care of the compressor related error code (thanks ricky bobby!) but I still have two level sensor error codes (one for the front right and one for the rear left).

Are the below voltage values enough to indicate that these two sensors are definitely faulty and in need of replacement? I suppose I also need to inspect the wiring harness to each sensor as that has seemed to cause issue for other members.

What has me concerned is the fact that the Tire Pressure light will not go out regardless of what I do. Perhaps it will resolve itself once the SLS issue is sorted out? I've adjusted the ride height via INPA so at least the truck is level in the meantime. Any thoughts?
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Old 03-02-2015, 01:07 PM
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Old 03-26-2015, 01:37 PM
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After removing the wheels and checking the wiring I can find no cracks or faults. Looks like it's got to be the sensors at this point. Finding the correct part numbers has been a mess, getbmwparts.com gave me one set of numbers and indicated there were only 3 sensors total, ecs another, and real oem another.

Took off all four wheels and have a different part number for each corner's ride height sensor. Ordered up the two that I believe I need and will report back after they are installed.
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Old 03-26-2015, 02:00 PM
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Check it the levers connected to the suspension components are moving freely.
When I replaced mine the rear axle sensors weren't moving easily and the "ball joints" in the levers were stuck.So the geometry of the movement was wrong and it was affecting the voltage/reading and how control unit saw the X's position/load.

Rear sensor can go on either side.

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After removing the wheels and checking the wiring I can find no cracks or faults. Looks like it's got to be the sensors at this point. Finding the correct part numbers has been a mess, getbmwparts.com gave me one set of numbers and indicated there were only 3 sensors total, ecs another, and real oem another.

Took off all four wheels and have a different part number for each corner's ride height sensor. Ordered up the two that I believe I need and will report back after they are installed.
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Old 04-07-2015, 01:57 PM
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Replaced the two "headlight" sensors that had funky voltage readings. Cleared up those codes. Interestingly, the new parts from BMW had the old part numbers dremeled off, lots of confusion over these numbers.

Now I'm still getting an error from the compressor from time to time. It seems that once the reservoir drops to a certain level it throws the code but if I go into INPA or GT1 and manually increase reservoir pressure it behaves normally until it drops again.

Sound like the compressor is past the point of no return? I've already rebuilt it...
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Old 04-07-2015, 03:15 PM
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Hello, I am wondering if you used the gasket o-ring set for the compressor or replaced the cylinder part too? As sold by ECS tuning

It makes a difference because the cylinder walls were scratched when I replaced mine. I think I need to buy the full kit from ECS.

Also I will check the valve group and hose connections for any leak. The problem I noticed is the hose going out from the compressor to valve group is always empty/no pressure when I take it out and I did not open the exhaust valve or anything.
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Old 04-07-2015, 03:24 PM
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I only used the parts in andy's rebuild kit. I did not go the full ECS kit.
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Old 04-07-2015, 03:24 PM
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I was able to build (very slowly) reservoir pressure up to 19 bar last night before the temps hit the high end of operating range.
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Old 04-07-2015, 03:25 PM
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Old 04-08-2015, 10:01 AM
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Tire Pressure Light and SLS light came back on... Dammit.
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