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Porsche Cayenne 958: Air Suspension In-Depth Repair Guide

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Hey, fellow Porsche fan! So, you’ve got a Porsche Cayenne 958 equipped with an Air suspension system, huh? What a machine! Aren’t you lucky? With that ride, you will cruise those city lanes and rugged terrains in unparalleled comfort! 

But even the finest of vehicles have their off days! Picture this: you’re walking up to your Precious Cayenne, and it’s looking a bit…low? It’s not that your car suddenly turns into a low rider! Yeah, I know! A low-rider setup is cool, but not for a Porsche Cayenne. 

Yep, we’re talking about that pesky “suspension sagging” issue. But fret not! We’re here to fill you in on why your Porsche Cayenne 958’s suspension is feeling down. And how to lift its spirit!

What Could Go Wrong with Your Air Suspension?

So, the air suspension system? It’s kind of like a rock band with many members. And while each part plays its own tune, some are, unfortunately, more likely to hit the wrong note. So, let’s jam about the usual suspects — the parts most likely to throw your air suspension off its rhythm.

Strut assembly leak

Hey, recall those air springs we chatted about? Bingo! They’re buddies with the shock absorber, sealed tight with a few O-rings. But hey, nobody’s perfect! Over time, these O-rings might start feeling a bit under the weather and let some air sneak out. And sometimes, the shock absorber might spill its drink (I mean, fluid), which isn’t good news for those O-rings either. Oh, and about the airbags? They’re made of rubber. Just like that old rubber duckie in your tub, they too can show wear and spring a leak. 

Air compressor leak/defect

Alright, imagine this: your air suspension system has sprung a leak (not cool!). This can stress out the air compressor, making it work so hard it’s practically sweating bullets! Overworking can get it all hot and bothered, and when that happens? Those seals and gaskets in there might throw a little tantrum. And if they do, the air compressor can start slacking off or freeze up the whole operation from the inside

Electronics Air Suspension Issues

Hey, you know how complex gadgets can sometimes act up? Same thing about air suspension systems! They’ve got all these electronic bits and pieces. The big baddie among them? The air compressor relay. Like I said, if those struts get a sneaky leak, the compressor works overtime. That’s like making your grandma run a marathon! So then, the relay gets all stressed out and might just throw in the towel.

Imagine this: your compressor gets stubborn and keeps draining power until – BOOM! – that 40A Maxi Fuse says “no more!” From a tiny strut leak, you’re now dealing with a busted compressor, a grumpy relay, and a fuse that’s had enough. Wild, right? It’s like missing a tiny snowflake and then getting buried in an avalanche!

Oh, and don’t even get me started on the height sensors! These little guys are out in the wild, not really hidden away. I’ve heard tales of our little friend Jerry (yes, the mouse from “Tom and Jerry”) nibbling on them. And on super chilly days, they might even get all iced up and snap. Yikes!

Guess what? The solenoid valve unit isn’t invincible either – it can break down, too! Made up of these itty-bitty air valves and a pressure sensor, things can get clogged up if they’re not running smoothly. Especially if the compressor decides to throw a tantrum and seize up, you might find tiny metal chips going on a journey right to the solenoid valve unit, messing up those delicate valves and the pressure sensor. Talk about a tiny troublemaker, huh?

Bottom line? Don’t sleep on those small issues. Tackle them early, or your wallet’s gonna feel it big time. It’s like that wise thing grandma always dropped: “Better safe than sorry!”

Compressed air lines

Alright, get this — it’s super rare, like seeing a unicorn rare, but those air lines coming from the compressor? Yeah, they can start leaking, too! Sometimes, they get all squished, poked full of holes, bent out of shape because of a bump, a fender bender, or maybe just a not-so-great repair job. And believe it or not, we’ve even heard stories about Jerry deciding to have a taste of them, too! Crazy, right? So yeah, it’s wild stuff, but it happens!

Fix That Sagging Air Suspension!

Alright, all you wrench warriors and gearhead gurus, you’ve got the lowdown now, right? When these little oops moments strike, it’s all about arming yourself with the right tools, a touch of zen, and maybe even some cool upgraded parts to give your ride that extra oomph. So, let’s raid that toolkit and get ready to turn some wrenches!

And hey, big shoutout for hanging with us through those not-so-glamorous boring bits. Your patience is rock solid, and we love that about you! Whether you’re here for a quick fix or in the mood to give your car a little extra love with an upgrade, you’re in the right place. Let’s roll up our sleeves and get down to business!

Alright, now that we’ve got that out of the way, let’s ensure you’re all set up in a safe spot and have the right tools in hand. And hey, don’t forget to gear up with your safety equipment— we’re talking goggles, gloves, the whole shebang! After all, we want you to walk away from this in one piece.

Hold on a sec — let’s not forget this golden rule: Keep it squeaky clean, folks! With all the tiny pathways for air through the pipes and all the inner workings of the air compressor and solenoid valve unit, even the tiniest bit of dirt can throw a wrench in the works. So let’s keep it all spotless, alright? Just a little heads up for smooth sailing!

Alright, team, before we jump in, let’s hoist that car up on jack stands and pop off those wheels — we’ve actually covered this topic in our lower control arm article, and trust me, it’s a pretty fun read! Once that’s done, you’re on to venting the air suspension to ensure those struts are air-free and ready to rock!

Strut assembly replacement

If you have a leaking strut assembly, there are two ways to fix it. You can replace only the air spring itself or the complete air suspension strut assembly, including the strut. Either way, if you are to proceed with any of those fixes, it is recommended to replace them in pairs. You don’t want to fix the left side first; a month later, the right side gives in. Additionally, do not drive your Cayenne while it is lowered due to a leak. It can damage the remaining good air springs.


Locate the stabilizer links on the wheel well area and remove them using a ratchet and socket or a combination wrench. Next, disconnect the airlines using a flare nut or open-ended wrench. Then, you’ll have to loosen the nut on the upper control arm and disengage the ball joint using the puller. The hub carrier will then hang outward, supporting it with a wooden block or anything to prevent your drive shaft, brake line, and wirings from being stretched out.

You will then have to loosen the lower strut nut. Keep the bolt in there so the strut assembly won’t fall accidentally once you proceed. In the next step, on the engine compartment area, you will have to remove the three upper strut mount nuts. Remove the shock absorber electrical connection as well. Then, back to the wheel well area, remove the lower strut bolt. Guide the air spring strut assembly out, and that’s it


For the rear strut assembly, you will have to open up the rear boot and remove those flooring covers. Remove the left and right trim by removing the floor cargo net hooks. Push it forward, then lift it off. The next step is to locate and remove the four screws that hold the air spring struts.

At the wheel well area, locate the air line and remove it from the air spring strut. Next is to disconnect the shock absorber electrical connection. Finally, remove the lower strut bolt and guide the air spring strut assembly out of the wheel well area.

Air compressor replacement


First things first, we need to take off the right-side running board inner cover. Don’t worry, it might sound fancy, but it’s pretty straightforward. Depending on your car’s model and extrasyou might find a plastic or aluminum cover there. Once you’ve got that out of the way, you’ll spot the air compressor sitting snugly just right about under the front right seat.

Now, grab a flare nut wrench or an open-ended wrench, and let’s get those air lines off the solenoid valve unit. They are color-coded, so you’ll not get confused about which pipe goes to which connection. And remove those wire sockets too! And here’s a little heads up — the compressor and the valve unit, they are like best buddies; they come out together as one.

Got everything out? Great! Now comes the part where you play mix and match, transferring all the little bits and bobs from the old compressor to the shiny new one. We’re talking wires, pipes, those squishy rubber mounts, mounting brackets, and yes, the solenoid valve block too. Let’s get all that swapped over and you’re golden!

Electronic component replacement


Replacing the relay will require bending over and going under the steering wheel. So, stretch out a bit; it will help. Remove the plastic trim under the dash using a Torx key. Once done, you will find the relay support 1. The relay for the air compressor is located there, position 1.


The fuse for the air compressor is located on the left side fuse box panel. For this, you’ll have to open the door and remove the cover on the left side of your dashboard using a plastic trim remover. Once removed, you’ll see the 40A maxi fuse on location #56. Check if it is blown. If it is, just replace it! Just remember that the fuse is blown for a reason, so do not install a new one if that reason is not yet resolved. Otherwise, it will be blown again. 


As I mentioned before, the solenoid valve block is attached to the air compressor. To replace this, you’ll have to pull down the whole assembly. Once removed, the valve unit can be removed from the assembly by removing the attachment screws. Quite straightforward, right?SHOP NOW


Replacing the height sensors is quite straightforward. You’ll just have to ensure the right part is installed in the right area and the sensor’s arm orientation is the same when you remove it.  

Air lines repair


Locating the leak will be either easy or hard. It really depends on what happened to your car. If your car has a recent fender bender as we talked about, the squished/punctured air lines should be near the damaged part. The hard part is locating the leak if a botched repair causes it or a vermin chews it off. You might have to pressurize the pipe to check if it is okay. Look for a pressure drop and a hissing sound to know if a leak exists.


Found the leak? Get an air line repair kit! It should be sized at 6mm and rated at least 145 psi. The repair itself is easy-peasy, too. Cut off the damaged section — Just make sure it is a clean cut. Install the new fittings, and that’s it!

Finalizing Repair of Your Air Suspension

Any of those repairs will have a concluding work. If you’ve opened the compressed air lines, you will have to fill up the air suspension again. You’ll then have to perform height calibration. So bring out your trusty OBD scanner and get it done. As for the relay and fuses, chances are you are replacing them with other components, so you will have to perform those steps too!


Remove the right side running board cover. Once removed, you will find the tank reservoir right about under the driver’s seat. In the tank reservoir, you will find a filling port. Connect the nitrogen tank set to 245 psito the filling port using a quick-release adapter from a manifold gauge — preferably, use a new tool so it won’t contaminate the air suspension system. Once done, use the OBD diagnosing tool to proceed with suspension filling. It’s that easy. 


Using the OBD diagnosing tool again, proceed with the air suspension calibration function. Now, the OBD tool will ask you to provide the height measurement. This is to be measured from the center of the wheel to the edge of the fender while the car sits on its weight. Do that for all the wheels and enter it on the OBD tool. Once done, the air suspension is now successfully calibrated, and you are ready to go. 

Find the Right Parts for Your Porsche Cayenne Air Suspension!

Wrapping things up on the Porsche Cayenne’s air suspension system, we’ve covered a lot from how it functions, tips on diagnosing issues, to getting down and dirty with repairs. It’s a complex system, but with the right know-how, you’ve got this! When it comes to getting your hands on quality parts, don’t hesitate to check out eEuroparts.com. With a reputation for quality and durability, their inventory ensures you’re investing not just in parts but in longevity and reliability for your Cayenne. Because when it comes to your vehicle, “Right Parts That Will Last!” isn’t just a statement; it’s a promise. Here’s to many more smooth rides on the horizon!



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