Hi everyone -
Got a problem with my 2006 xj6 2.7 TDvi.
Had two new front tyres fitted a few days ago. The car was raised on its correct lifting points, allowing the suspension to drop fully.
Since then the front suspension is so low it's more or less non-existent and I'm now getting an "air suspension fault" alert on the dash. Ptior to this it was working perfectly.
Took it to a local garage, their diagnostics are not really up to snuff for jags. They reckoned it was the ?control module? and have just pointed me at the nearest Jaguar dealer.
Anyone any ideas before I blow my wallet apart by doing this? Thanks!

 

Where to start ?
This could be multiple reasons.
diesel so you only one heightsensor in the front.
Did they lift the just in the front or all 4 wheels in the air?
I am asking because my first thought is low airpressure left in the tank because of air compressor turning weak . While all the struts where completely expanded .
had the same happening 3 years ago also for tyres but I had then" vehicle too low" on the dash . I check the height got the yre tread evenly just near the arch so not touching the plastic inner liner. Drove around the block with around 25 mph compressor started and rose the car.
I would start engine again, compressor starts pumping air for about max 2 min before shutting off again.
if that does not raise the car put the transmission once into Neutral with your feet on the brake and look over the bonnet.
no raising next point.
The height sensor is installed to the subframe with a bracket and two short bolts .
-They tend to rust and with age csn bend or even brake
Then they have a short lever arm on the front connecting the rectangular black plastic box to one of the suspension arms.
arms are two plastic O 's connected by a steel rod about 3 inches long. (Rear 4 inch)
if broken get a new front one (cost about 90€ )at jaguar or elsewhere , breaker
Naturally if the car is to low they are difficult to check.
maybe you have callisto rims then look through

 

Hi thanks for the reply. When the tyres were changed they lifted the front end only, allowing the suspension at the front to drop fully. You think that might have something to do with it? Thanks

 

To figure out what is going on, it helps to have a basic understanding of how the OEM air shocks work. At vehicle start up a compressor under the front bumper fires up and sends air to a reservoir tank in the boot (trunk). Air from the reserve tank is then sent to each of the four air shocks on an 'as needed' basis. This takes place during the first few minutes of turning your car on. You should be able to hear the compressor and watch the vehicle rise when you turn it on. If it doesn't rise (or fall about ten minutes after being turned off) then the compressor is probably the fault. The ring inside the compressor wears out but is an easy fix and less expensive than replacing the compressor. In my case, turning on my '08 Vanden Plas caused all four shocks to "lift" the vehicle on start, but withing five minutes my front driver's side shock would make a 'hissing' noise and it would fall noticeably. I could still drive the car, but the air suspension fault, and later the vehicle too low faults would appear on the dash. I replaced the two front OEM air shocks with the Arnott aftermarket air shocks. They are just plug and play and the fault lights, etc. went away and I have a nice smooth ride. Perhaps a bit firmer than the OEM air shocks but perfectly acceptable. They were a fraction of the cost of OEM air shocks. My biggest problem was that with all the salt we use on Nova Scotia roads the control arms were so badly rusted that I couldn't loosen them to do the replacement, and wound up cutting them off and replacing them with new upper and lower control arms. The replacements are aluminum rather than steel - so here's to hoping they don't rust.

 

Hi
as a footnote to this thread, I can report that the fault is fixed. Took it on recommend to Straight Line Performance in Malvern UK. Can't recommend them highly enough. They found the height sensor body had cracked, allowing water in, which the shorted the unit and hey presto, no air.
of interest is the fact that they're really audi specialists and discovered that the sensor is exactly the same as one off an Audi TT - right down to the part number!
A yway thanks for all the suggestions.

 

Thank YOU.. for reporting back!

Anecdotal evidence is that it was WABCO, not Bilstein, who packaged the whole shebang.. then sold it to most German automakers, BMW, Mercedes, VW/Porsche/Audi, and a few Japanese as well as to Jaguar.

Before discovering a Chinese source for near-as-dammit ALL of the parts, all makes as used them. I had sourced new compressor mounting springs and rubber bushings under a Mercedes-Benz part number... from Poland.

Of course they fit.. same system, different mothership. Polish vendor may have been on-selling parts from China?

Globalization. It is now possible to have a part on backorder on six continents at once.

 

That is easy: order it from 7th continent!

 

Cost of shipping by refrigerated container makes that uncompetitive even for the rebuilt ice-cube bizness.

A wiser merchant might stay closer to-home and make a fortune more reliably by recycling used condoms into air strut bladders.

Or better yet, politicians?

Not as if you'd have any expense for Quality Control on that second option, is it? Politicians are expected to leak.