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tspd



Member Since: 13 May 2024
Location: London
Posts: 66
United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Buckingham Blue
Rear suspension looks collapsed (but isn't!)

Hi all,

Hoping you can help with the below. Front bags replaced a few months ago, I understood rear bags were (relatively) bulletproof. Woke up this morning with the rear sagging slightly. Did the old leave in off road mode overnight and it resulted in this hilarious configuration, arse down nose up:





Anyway, I got in - suspension fault displayed. Drives fine. No hissing from bags. I watched a video from my house CCTV and it clearly shows the car lower over 30 seconds but only at the rear, about 3 hours after locking. This is the periodic wake up check if level system I believe. Leaving in access mode the difference is clearly less obvious and does not result in suspension fault error when starting - it just raises up.

Leads me to think it is a sensor. Going into IID, I have below error:

RLM-Suspension
* C1A74-1C (2E) Rear left height sensor mechanism - General electrical failure - circuit voltage out of range
( on 01-05-2025 04:39:08 at 216747 km )
* C1A05-1C (2E) Rear left height sensor - General electrical failure - circuit voltage out of range
( on 01-05-2025 08:42:04 at 216747 km )

The below screenshots show the voltage readings if helpful:


Click image to enlarge



Click image to enlarge



My question is, for those in the know:

1. Is this safe to drive like this for now (presuming the suspension levels prior to setting off, which it does)
2. Is this definitely just a simple height sensor replacement? If so why is the voltage normal? It was fluctuating slightly more than the right side on IID, the right side being a rock steady voltage - but the readings are similar as you can see.

Thoughts appreciated!

Thanks in advance as always. L322 2007 S/C 4.2L (first full fat)
135k miles and counting
Buckingham Blue
Post #717220 1st May 2025 1:28pm
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diesel Dave



Member Since: 14 Aug 2015
Location: Stockport
Posts: 488
England 2019 Range Rover Autobiography SDV8 Santorini Black

Looks like you do have a height sensor problem, but to eliminate a leak, put it in off road height then disconnect the battery and leave it over night, if it goes down you have a leak, if it doesn’t it’s more likely to be electrical, hopefully the sensor Thumbs Up
Post #717231 1st May 2025 4:20pm
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fisha



Member Since: 25 Sep 2009
Location: Scotland
Posts: 1483
2015 Range Rover Autobiography SDV8 Aruba

Is it possible that the arms have flipped over on the sensors to be the wrong way round when you’ve been doing work ? V8 or else ...
Post #717285 2nd May 2025 5:36pm
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Dtech



Member Since: 29 Nov 2014
Location: Yorkshire Dales
Posts: 75
England 2011 Range Rover Vogue 4.4 V8 Santorini Black

My vehicle did very similar, but lowered at the front and raised the rear. It turned out to be a faulty height sensor. Found the culprit by removing each sensor arm in turn, and moving them throughout their range whilst monitoring the voltage on the iid tool . The voltage should be a smooth transition with no spikes.
Post #717305 3rd May 2025 11:22am
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SeldomSeenKid



Member Since: 24 Jan 2024
Location: Glasgow
Posts: 84
Scotland 2008 Range Rover Supercharged 4.2 SC V8 Stornoway Grey

Wouldn't a faulty height sensor not show up on the 4x4 display in the head unit?
One of the corners would show out of level. ---------------------------------
2008 L322 Supercharged
2007 Porsche 987 Boxster S
2024 BMW iX3
Post #717306 3rd May 2025 11:32am
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tspd



Member Since: 13 May 2024
Location: London
Posts: 66
United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Buckingham Blue

You would think, but it did not.

Just to follow up here in case anyone else has trouble, on my 07 supercharged replaced the height sensor with this item and its right as rain.

RQH500451 - LR parts L322 2007 S/C 4.2L (first full fat)
135k miles and counting
Buckingham Blue
Post #718698 27th May 2025 10:47pm
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