Audi S4 2018

• Recall 183532 [USA]: A disabled passenger air bag increases the risk of injury in the event of a crash.
  Volkswagen group of america, inc. (audi) is recalling certain 2017-2020 a4 allroad, a4 sedan, 2018-2019 rs5 coupe, 2019 rs5 sportback, 2018-2020 a5 cabriolet, a5 coupe, a5 sportback, s4 sedan, s5 cabriolet, s5 coupe, and audi s5 sportback vehicles. The cable connecting the seat heater to the passenger occupant detection system (pods) may have a contact fault, causing the software to misdiagnose a malfunction and disable the passenger air bag.
  dealers will replace the connecting cable and either the heating mat or entire seat cover, free of charge. Owner notification letters were mailed january 7, 2022. Owners may contact audi customer service at 1-800-253-2834. Audi's number for this recall is 74e3. This recall is an expansion of recall 19v-547 (74d9). Vehicles previously repaired under 19v-547 will need to return for the new remedy.
  owners may also contact the national highway traffic safety administration vehicle safety hotline at 1-888-327-4236 (tty 1-800-424-9153), or go to www.Nhtsa.Gov.

• Recall 157587 [USA]: A disabled passenger air bag increases the risk of injury in the event of a crash.
  Volkswagen group of america, inc. (audi) is recalling certain 2018-2019 audi rs5 sportback, 2018 s5 cabriolet, s5 sportback, s5 coupe, s4 sedan, a5 cabriolet, a5 sportback, a5 coupe, and 2017-2018 a4 sedan and a4 allroad vehicles. Oxidation on the passenger occupant detection system (pods) connecting cable may cause the software to misdiagnose a malfunction and disable the passenger air bag.
  audi will notify owners, and dealers will install cable ties to the harness, free of charge. The recall began september 9, 2019. Owners may contact volkswagen customer service at 1-800-893-5298. Audi's number for this recall is 74d9.
  owners may also contact the national highway traffic safety administration vehicle safety hotline at 1-888-327-4236 (tty 1-800-424-9153), or go to www.Safercar.Gov.

• Recall 2021688 [Canada]: Airbag
  Issue: on certain vehicles, the passenger occupant detection system (pods) may malfunction. This could cause the airbag system to turn off the passenger-front airbag even when a passenger is seated. Note: this problem would cause an error message to display on the instrument panel and a warning chime to sound. The airbag indicator light would also display "passenger airbag off". Additional note: for the 2020 model year a5 model, only the a5 sportback is affected by this recall. Safety risk: an airbag that is turned off could increase the risk of injury to a passenger in a crash. Corrective actions: audi will notify owners by mail and instruct them to take their vehicle to a dealer to inspect the front passenger seat. Depending on the seat type, the dealer will either replace the seat heating mat including the connecting cable or the entire seat cover.

• Recall 2019361 [Canada]: Airbag
  Issue: on certain vehicles, the passenger occupant detection system (pods) may malfunction. This could cause the airbag system to turn off the passenger-front airbag even when a passenger is seated. Note: this problem would cause an error message to display on the instrument panel and a warning chime to sound. The airbag indicator light would also display "passenger airbag off". Safety risk: an airbag that is turned off could increase the risk of injury to a passenger in a crash. Corrective actions: the company will notify owners by mail and instruct them to take their vehicle to a dealer to install cable ties on the wiring harness under the front passenger seat.

To ensure accuracy and for your safety, it is recommended to do a free VIN recall check here or here [USA] - UK - Canada.

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

Common OBD Error codes specific to this vehicle.

• P0A7D [5] Hybrid Battery Pack State of Charge Low
• B200F [10] B200F
• B13BC [4] B13BC
• C110D [5] C110D
• C100C [1] C100C
• B1225 [2] Fuel Temperature Sensor #1 Circuit Short to Ground
• U0300 [1] Internal Control Module Software Incompatibility
• P0000 [1] Reserved
• B1092 [1] B1092
• B11AF [1] B11AF
• B1455 [5] Wiper Washer Fluid Lamp Circuit Open
• P2181 [7] Cooling System Performance
• P017B [7] ISO/SAE Reserved
• P3081 [7] P3081
• P01E4 [7] P01E4
• B1916 [1] Air Bag Driver Circuit Short To Battery
• B13B9 [3] B13B9
• U10CF [3] U10CF
• B14FF [1] B14FF
• B2000 [1] B2000
• C05ED [3] C05ED
• U1013 [2] SCP (J1850) Invalid or Missing Data for Primary Id
• C0502 [1] Power steering system, solenoid - low input
• C0508 [1] Power steering system, humidity sensor: steering wheel - high input signal
• B1304 [1] Accessory Delay Relay Coil Circuit Short To Battery
• B1305 [1] Accessory Delay Relay Coil Circuit Short To Ground
• P0087 [3] Fuel Rail/System Pressure - Too Low
• P1950 [4] P1950
• P10EF [2] P10EF
• B10F0 [2] B10F0
• P060C [2] Internal Control Module Main Processor Performance

The vehicle's pre sense auto-braking and braking alert jolt has been activating erroneously and have almost caused accidents at speed. The system cannot be permanently disabled, it deactivates upon ignition restart. The system has erroneously and aggressively jolted the breaks on several occasions on curves, especially when cresting a hill with vehicles parked on the downward sloap. Clearly, it is mistaken the parked vehicles for a potential impact, either aggressively jolting the breakers and/or breaking. This is not only very frightening but on a slippery surface, would have caused an accident. This feature also activated on the highway at 65+ mph while safely changing lanes, and almost led to my vehicle being rear-ended. There should be a way for a driver to permanently disable or customize this feature to better adapt to environmental and/or unique driver conditions. As is, this feature has been dangerous!

There are two large "underride guard" panels on the underside of the vehicle that are fastened by small, loose-fitting plastic clips. There is also felt sound-deadening material on the exterior side of this panel. When the vehicle is driven in rain or snow, the panel collects snow or water under normal driving conditions and breaks free unexpectedly, causing the panel to contact the road and drag on the ground. This dragging causes a "rudder effect," pulling the vehicle rapidly and unexpectedly in an unpredictable direction. The vehicle is in motion at varying speeds when this occurs; it has occurred at approximately 30 miles per hour, 40 miles per hour and 65 miles per hour.

When driving in manual mode and transition from on the throttle to off-throttle, there is a 1-2 second delay before the engine stops accelerating and transitions to deceleration. Especially in first gear, this means that the vehicle continues to accelerate for that period of time. I drove another model of audi with the same engine/transmission (2018 s5) and it exhibits the same behavior. Since the car does not have a physical throttle cable, this would seem to be caused by the throttle not closing as commanded by the ecu or there being a delay in the throttle being commanded to close. This has not caused a collision but easily could.