Hi all, I'm hoping for some advice/guidance, as I'm just confusing myself searching the Forum & Google for some help, and apologies if this has been talked about hundreds of times before.

I have a 2011 4.4 TDV8 Autobiography which has started throwing up a couple of errors. It started a couple of weeks ago, just occasionally, and now happens every time I go for a drive. The 2 errors are; Forward Alert Unavailable and Normal Ride Height Only. If I stop, turn off and restart the errors go away & suspension works fine, then a few miles down the road they come back again. Also, the cruise control is unavailable when the errors are 'active' on the dash.

I took the car to a very good local independent who plugged in their diag kit and advised it needs a new compressor, and want to charge me circa £1000 supply, fit & tax.

I have some queries I'm hoping you can help me with;
1. Do you chaps agree it's the compressor? I've seen threads suggesting a ride height sensor or wheel speed sensor issues
2. Is £1k a fair price? - it seems a bit steep to me, but recognise half of that is probably the parts
3. If I go for the DIY route (which I think I'm capable of) which compressor should I go for? I found this one on a google search; https://aerosus.co.uk/land-rover/range-rov...essor.html
4. What's the relay for? Is it to code the new compressor to the car, meaning I don't have to 'flash' anything in the ECU?

Any help, advice, greatly received, thanks.

Do you know what the codes are?

£1k for compressor change is *WAY* over the top -- and yes it's a DIY job, unless you have the ability to tell the car it has a different compressor model I'd stick with the same version, so you'll need to take the cover off and get the part numbers.

I would advise a little more research before anything else Current: 2011 FFRR Vogue SE 4.4 TDV8
Previous: -
2004 FFRR Vogue 4.4 V8 with LPG
1997 P38 4.0 SE with LPG
1997 P38 4.6 Vogue with LPG

Last edited by Bushy30 on 30th May 2019 12:17pm. Edited 1 time in total

The normal height only message occurs when the compressor can't get the reservoir up to pressure within the allowed time. Whilst this could be due to a weak compressor, it's more likely for a 2011 model that there is an air leak. The front air-springs are prone to failing, with slow leaks initially which leak faster as the holes extend or more holes open-up.

Does the front of the vehicle lower overnight, perhaps noticeably on 1 side only but usually both sides? Raising the vehicle to off-road height then spraying soapy water around the base of the front springs should reveal if the springs are leaking. My April 2012 build has had both front springs replaced due to a multitude of leaks in each from apparently porous rubber.

Thanks Graeme, I had this with my previous TD6 and it was noticeable due to the dropping of the front overnight. This is not happening with my TDV8, even when left overnight in off-road height, so I don't think it's a leak or failed air spring.

Bushy30 wrote:

Do you know what the codes are?

£1k for compressor change is *WAY* over the top -- and yes it's a DIY job, unless you have the ability to tell the car it has a different compressor model I'd stick with the same version, so you'll need to take the cover offand get the part numbers.

I would advise a little more research before anything else

A low battery can throw up random errors. Just a thought but a common cause of gremlins.

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

Sorry, for clarity the 'more research' comment was to find your part number from the compressor and to get some fault codes (if possible) we'll all be able to help much more then  Current: 2011 FFRR Vogue SE 4.4 TDV8
Previous: -
2004 FFRR Vogue 4.4 V8 with LPG
1997 P38 4.0 SE with LPG
1997 P38 4.6 Vogue with LPG

Thanks Bushy, I'll try to get some time over the weekend to get the codes & part number and post back

gonna_go_double_r wrote:

A low battery can throw up random errors. Just a thought but a common cause of gremlins.

.

The problem is without the fault codes it's just guess work, and most of that will be random.

With the codes it becomes guess work, but a little more specific  Current: 2011 FFRR Vogue SE 4.4 TDV8
Previous: -
2004 FFRR Vogue 4.4 V8 with LPG
1997 P38 4.0 SE with LPG
1997 P38 4.6 Vogue with LPG

Where in kent are you speedster ?

Hi, I used to get that error on mine? first, check the small wires that come from the top of the suspension struts( adaptive suspension) the error will also come from compressor overheating not reaching/maintaining pressure try these people for the compressor that's where I got mine? or try Dan on here?
https://www.rst-landrovers.co.uk

Last edited by Tinman on 31st May 2019 8:44am. Edited 1 time in total

Forward alert is a function of the radar unit and the pcm and not directly associated with the suspension module. However forward alert will be disabled if any condition exists with other systems that could compromise the ability of forward alert to function properly, such as the suspension system not fully operational.