2018 Audi RS3 Problems: 9 Known Issues

On the 2017-2020 Audi RS3, nHTSA campaign 21V198000 covers 2017-2020 RS3 Sedans among roughly 153,000 Audi A3-family vehicles. The passenger occupant detection system sensor mat built into the front passenger seat cushion can malfunction and switch the passenger airbag off even when the seat is occupied. The driver sees the PASSENGER AIRBAG OFF telltale stay lit with an adult in the seat, and in a crash that occupant would not be protected by the front airbag. This is the broader follow-on to the earlier connector-related PODS recall and involves the sensor mat and its control module rather than wiring alone, so a car that had the 2019 remedy may still need this one.

On the 2017-2019 Audi RS3, the earlier of the two RS3 passenger-airbag recalls, NHTSA campaign 19V474000, covers 2017-2019 RS3 Sedans. A loose contact at an electrical connector in the passenger occupant detection circuit, aggravated by a sharply bent airbag cable under the seat, makes the system register a fault and switch the front passenger airbag off with an occupant in the seat. It is a wiring and routing defect, distinct in cause and remedy from the 2021 sensor-mat campaign, and a car can legitimately be subject to both. Symptoms are often intermittent and can appear after the passenger seat has been slid fore and aft repeatedly.

On the 2018 Audi RS3, two separate 2018-model-year campaigns cover the rear seat head restraints on the RS3 Sedan. NHTSA 18V803000 addresses rear seat frames on which the head restraint guide sleeves may have been improperly or insufficiently welded to the seat frame, so the restraint may not be held securely. NHTSA 19V095000 addresses rear center head restraints that left the factory missing their latching pins. In both cases the head restraint can move or come free in a rear impact, removing whiplash protection for a rear occupant. These are easy to overlook on a performance car whose owners rarely use the rear seat, and both were issued while the 8V was still in production.

On the 2017-2020, 2022-2023 Audi RS3 2.5L TFSI, the check-engine light or drive-system warning comes on, or the engine does not start. The engine module stores either no fault, or fuel-pressure sensor implausible signal (P019100) or rail pressure too low (P008700) or too high (P008800) with specific symptom codes. If Audi's Guided Fault Finding gives no result for these codes, the bulletin has the dealer add the intermediate-shaft speed sensor (G265) test. Applies to: 2017–2020 and 2022–2023 Audi RS 3 with the 2.5 TFSI five-cylinder (all VINs), per bulletin 2067757/3 (July 31, 2023).

On the 2017-2020, 2022-2025 Audi RS3 2.5L TFSI, audi states that contaminated gasoline, or gasoline low in deposit-control additives, can build deposits on the intake valves, intake manifold, fuel injectors and combustion chambers. Results can include rough running after a cold start, long cranking, hesitation, rough idle, reduced performance, poor fuel economy, and a check-engine light with misfire, lean-fuel-system or air/fuel-ratio-imbalance codes. Applies to: All Audi vehicles from model years 2000–2025 (bulletin 2014753/13, December 5, 2024), which includes the 2017–2020 and 2022–2025 Audi RS 3 with the 2.5 TFSI five-cylinder. It is a diagnosis guide, not evidence that every RS 3 develops deposits.

On the 2017-2020, 2022 Audi RS3 2.5L TFSI, coolant loss or a leak is found and the coolant warning lamp comes on; the workshop finds the coolant pump is the source of the leak. Applies to: 2017–2022 Audi RS 3 with the 2.5 TFSI five-cylinder (all VINs), per bulletin 2073060/2 (May 21, 2024); also the 2018–2022 TT RS.

On the 2017-2020 Audi RS3, the 8V RS3 sends drive rearward through a Haldex-type electro-hydraulic coupling on the rear differential. Its weak point is not the gearset but the electric pump and the fine mesh filter screen ahead of it. Clutch debris and metallic wear particles progressively clog the screen; the pump is then starved, overheats and burns out, and the car quietly becomes front-wheel drive. Audizine threads document rear-diff and Haldex failures, whining or grinding from the rear that changes in turns, and clunking under load. Owners repeatedly trace the failure to a coupling that never had its fluid and screen serviced — the maintenance schedule under-emphasizes it relative to how hard an RS3 is driven. The next-generation 8Y RS3 replaced this hardware with the RS Torque Splitter, so this failure does not carry forward to 2022+ cars.

On the 2017-2019 Audi RS3, audi TSB 2059240/1 applies to RS3 vehicles equipped with Audi magnetic ride when knocking or rattling is heard from the rear over uneven roads and diagnosis confirms the rear shock absorbers. For the RS3 its scope is 2017-2018 vehicles and 2019 vehicles only within VIN sequence 000001-906967.

On the 2017-2020 Audi RS3 2.5L TFSI I5 (DAZA), front brake judder is the single most repeated complaint from 8V RS3 owners. Threads on Audizine and the Official Audi RS3 Owners Club describe a steering-wheel shimmy and brake-pedal pulsation appearing as early as 5,000 to 12,000 miles on stock front rotors and pads. Audi revised the front rotor design multiple times over the 8V US run and the complaint persisted. The mechanism is usually uneven pad-material transfer onto the rotor face rather than literal thickness variation from a bent disc, which is why the symptom returns quickly after a machining job. Owners frequently report Audi declining warranty coverage on the grounds that the brakes were overheated, leaving an out-of-pocket bill.