This page covers 2 recalls and EPA fuel economy for the 2018 Audi S4.
24 mpg combined
9.8 L/100km
Compact Cars
Fuel economy data from fueleconomy.gov (EPA / U.S. Dept. of Energy). Annual cost based on 15,000 mi/yr at 55% city driving and current fuel prices. MPG is U.S. gallons; L/100km converted.
The 2018 Audi S4 has 2 recalls, both involving the front passenger airbag, which can be disabled by a fault in the passenger seat detection system and fail to deploy in a crash.
Corrosion on the wiring connected to the passenger seat sensor can cause the system's software to misread the fault and shut off the passenger airbag entirely. A separate issue with the sensor itself can produce the same result. In either case, a front passenger would have no airbag protection in a collision.
At a glance
What can fail
A cable connecting the seat heater to the passenger air bag detection system may develop a contact fault, causing the system to incorrectly disable the passenger air bag.
What the fix does
Dealers will replace the connecting cable and either the heating mat or entire seat cover at no cost.
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Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Oxidation on the Passenger Occupant Detection System connecting cable may cause the software to incorrectly diagnose a malfunction and disable the passenger air bag.
What the fix does
Dealers will install cable ties to the harness at no cost to secure the cable and prevent oxidation.
Summarized — see the official notice for exact wording, dates, and contacts.
