Table 1 shows one common suspension related problems of the 2018 Audi A4.
| Problem Category | Number of Problems |
|---|---|
| Suspension problems |
Fortunately no catastrophic failure or accident occurred. At about 40,000k miles the rear spring mounts are significantly corroded and need replacing. This appears to be a galvanic reaction that occurs due to a design flaw which shortens the life of the critical mounts. I’m told one could fail imminently and the other is headed that way. Had this failed in use the damage would be significant and caused an accident. The service advisor said that Audi is aware of the short lifespan and has an improved version that will be used in the repair. I have a video of one of the mounts and will request the parts when repaired.
An Audi dealer installed 245/40r18 93h tires on this 2018 Audi A4, while the vehicle placard/specification requires 245/40r18 97h. The lower load index reduces capacity from 1,609 lb per tire to 1,433 lb per tire, approximately 704 lb total across four tires. This creates a safety risk because load-rated tires affect vehicle stability, heat buildup, braking, steering/cornering, suspension loading, and tire failure/blowout risk. After discovering the mismatch, the concern was reported to the dealer and Audi, but the dealer stated the 93h tires were acceptable rather than providing a safety-based correction. No crash, fire, injury, or fatality occurred. This complaint is being submitted because the vehicle may have been operated with under-rated tires and because the issue can affect handling, braking, tire durability, suspension/wheel components, and safe vehicle control. Tire/repair-order records, door-jamb placard evidence, load-index comparison evidence, and dealer communications are available.