[The PTRAIN17]

2016 qx80 here. I have pretty serious sag in the rear. I took it to a nissan dealership as the nearest infiniti one is quite far from me. After 2 days and 2 diagnostic fees, they determined the compressor is good (replaced in October 2024), but the left sensor is not working. They ordered in an aftermarket sensor for $600 CAD (OEM was $1400+), but after testing, only the right side was working. They now believe I need to replace the module and quoted me just over $3,000 CAD for the OEM one. They couldn't locate any aftermarket modules, but managed to find a used one they could bring in from another province for around $800. At this point I'm starting to feel like this is going to be a chronic issue. Any advice what to do here? Is it worth my time to go to the INFINITI dealership (1 hr drive away). Diagnostic fees at just under $200 per hour are bleeding me dry. I contacted a strut/suspension specialist shop in my area and they would be willing to assist with a converting to coil springs if I choose to go that route

 

[The PTRAIN17]

If this really a suspension module than it gets expensive. And you are stuck with the dealer as they need to re-program the module and set up the height properly. You need CONSULT for this. Its get complicated.

You could do a conversion in that case. Especially that you will need new shocks anyway. They are close to 10 years old. So I would consider this option for sure.

It really depends what is the condition of your vehicle and what you want out of it. If it is pristine and you want to keep everything OEM and perfect, then you will need to spend $$$. If you feel you just need a car that drives and don't care it needs to be OEM than save money and do the conversion.

Hey Pete, thank you for the response and recommendation. I can confirm the vehicle is pristine in every way. Dealer-serviced since purchase and all recommended work done. Currently has 110k KM (68k Miles), and the mechanic said shocks are still in great shape. After I posted this I actually purchased a used module off eBay and the dealership says they’ll install it for me when it arrives. Cost me $125 US, so even with the labor cost it won’t set me back much and might just fix the issue. 🤞🏼

edit: I should add that the used piece had a grade A inspection mark and was taken from a 2020 qx with 50k miles, so hopefully will go for a spell without needing replacement.

 

[The PTRAIN17]

Welp, a year after I posted in this thread…..the SAG has happened! It is noticeable. 2015 QX80 Limited, 86k on the clock. I could sometimes hear the compressor running but can’t hear it anymore. I drove it yesterday with my son, we took a route that had speed bumps and the ride over the speed bumps was very different. It felt like the truck was just resting on the rear springs. There was definitely no “bounce” or several bounces after driving over the speed bumps. I think the shocks may not be the culprit. Does the air leveling system effect ride or give a firmer ride?

Having just gone through this, I can say the difference between bumps with a working air suspension vs just the coil springs is significant. I was definitely not getting several bounces, it was very stiff feeling.

 

[The PTRAIN17]

Hey Pete, thank you for the response and recommendation. I can confirm the vehicle is pristine in every way. Dealer-serviced since purchase and all recommended work done. Currently has 110k KM (68k Miles), and the mechanic said shocks are still in great shape. After I posted this I actually purchased a used module off eBay and the dealership says they’ll install it for me when it arrives. Cost me $125 US, so even with the labor cost it won’t set me back much and might just fix the issue. 🤞🏼

edit: I should add that the used piece had a grade A inspection mark and was taken from a 2020 qx with 50k miles, so hopefully will go for a spell without needing replacement.

After all was said and done, I declined to have the suspension swap and decided to stick it out with air. I managed to find a relatively new module* on eBay with an A+ quality rating and only 35k miles on it, for about $120 US. The dealership installed the module, a new height sensor, and voila, we have lift off! Cost me about $1000 US all in. Ride is comfortable and smooth, have been towing a 3500lb tent trailer this past week with ease. Appreciate the help