Ugh, air suspension woes can be awful to troubleshoot. I sprayed gallons of soapy water into my wife’s 2015 Grand Cherokee and still couldn’t track a leak down. I changed it all out to springs in the end.

I’d focus on where the air might be leaking from which would lower both sides equally. The relief valve or compressor seem to be the only place in the system what is common to both sides. Or maybe the reservoir itself, or the hose that feeds it from the compressor could be leaking? I can’t recall the plumbing set up specifically.

Either way, I feel that it has to be some place that both sides have in common. Two new airbags leaking equally, independently seems super unlikely.

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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee