Airbag problems with the Audi A5 are a serious safety issue that mainly affects models from 2018–2020. A fault in the seat heating cable deactivates the passenger airbag. This increases the risk of injury in a collision. Some older models have defective sensors and airbag modules. Find out what you need to know to stay safe on the road.
The Audi A5 is known as a stylish and sporty car, but the airbag problems can be a serious worry for owners. Warning lights might seem annoying, but in a crisis these systems can mean the difference between life and death. Many owners of A5 Cabriolets, Coupes and Sportbacks from model years 2018–2020 received a recall notice from Audi around January 2022. Related models such as the S5 variants are also included in this recall.
The problem lies mainly in the cable between the seat heating and the Passenger Occupant Detection System (PODS). A contact fault disrupts the connection. The software then detects a malfunction. As a result, the passenger airbag is automatically switched off. This means that in a collision the airbag will not deploy when it should, with all the consequences that entails.
What the airbag warning light means on the Audi A5
The airbag warning light on the dashboard often gives the first sign that something is wrong with the safety system. This light stays on after starting the car or suddenly comes on while driving. It usually indicates a fault in the Supplemental Restraint System (SRS), the safety system that controls the airbags.
The causes are varied. Resistance faults in the passenger airbag igniter occur regularly. The resistance values are either too low or too high. Owners report on forums resistance values of around 3.2–3.3 ohms (the unit that indicates electrical resistance) for the driver airbag, while the passenger side often shows double fault codes. Sensor failures, damaged wiring and loose connections can also trigger the warning light.
After an accident the airbag module stores crash data. The system locks this data, similar to a black box in an aircraft. This causes the warning light to stay on until the module is professionally reset. Never keep driving with the airbag warning light on. The safety system will then not work properly in a collision. In the event of an impact, the car will therefore not offer full protection.
‘ These are life-saving systems. ’
How to reset the airbag after a fault
A simple reset sometimes helps with temporary faults. Switch off the engine, wait ten seconds and restart the car. This gives the system a chance to run a fresh self-check. If the light stays on, there is a deeper problem.
A thorough diagnosis requires an OBD-II scanner. This is a device used to read fault codes in the car. The scanner reads error codes from the airbag module. These codes indicate which component is causing the fault. Cheap scanners often cannot erase hard crash codes from the airbag module. Hard crash codes are faults stored after an accident that can only be cleared with professional equipment. For that you need professional tools.
After an accident a specialist will always reset the airbag module. The system stores crash data that does not disappear by itself. The seatbelt pretensioners (the parts that pull the belts tight in a collision) and the clockspring must also be checked. The clockspring is the spiral spring behind the steering wheel that maintains the electrical connection between the airbag and the electrical system while you steer. Do not try to fix this yourself without technical knowledge. These are life-saving systems.
Common airbag defects on the Audi A5
Besides the seat heating cable there are other common defects on the A5:
- Defective crash detection sensors in the bumper or side panels
- A faulty airbag control module: this disrupts communication between sensors and airbags
- Airbags that have exceeded their service life of about 10 to 15 years, especially on older models
- Damaged wiring due to rust, moisture or wear
- Takata airbags on older Audi models: this make/type of airbag has well-known recalls due to safety issues
The Takata recall may also affect certain A5 models. These airbags can explode when deploying and cause serious injury or death due to sharp metal fragments being released. Check with Audi whether your car is covered by this recall.
Some owners report striking observations. Their airbag warning light comes on after work such as replacing spark plugs (the parts that ignite the fuel-air mixture in the engine) or ignition coils (the parts that supply high voltage to the spark plugs). The airbag module constantly communicates with the engine control unit. That is why a disturbance in the electrical system quickly triggers a fault code.
Solutions and repair options
Audi offers a free repair for cars that fall under the official recall. The dealer replaces the connection cable and the seat heating mats. The dealer will also replace the entire seat upholstery where necessary. The new cables have better shielding to prevent contact faults.
Have you already had the repair carried out at your own expense? Then you may qualify for reimbursement. Contact Audi customer service for more information about this compensation scheme.
If sensors or wiring are defective, first check for visible damage yourself. Inspect the sensors in the bumper and side panels for damage. Also look for signs of corrosion on electrical connections. Replace defective parts, but always leave configuring and adjusting the software in the modules to specialists.
Professional help is required to reconfigure the airbag module after an accident. Specialist companies erase crash data and reprogram the module. Erasing crash data means that all information about the collision is removed from the module’s memory so that the system works properly again. This approach is cheaper than replacing the entire module. Only have this done by approved companies. Only they can guarantee safety.
Costs of airbag repairs
The cost of airbag repairs varies widely depending on the problem:
- Diagnosis with OBD-II scanner: €50 to €100 at a garage
- Replacing a sensor: €100 to €300 each including labour
- Reconfiguring an airbag module: €150 to €400 at specialist companies
- Replacing an airbag module: €400 to €800, costs vary by type
- Seat heating cable and mats: €300 to €600, free under the recall
Audi always carries out repairs under the official recall free of charge. This applies to A5 Cabriolet, Coupe and Sportback models from 2018–2020, as well as S5 variants from the same period. Check whether your car is included, even if you have not received an official notice.
Postponing repairs leads to higher costs. A small issue with a sensor can, for example, lead to damage to the entire airbag module if it is ignored. Driving with a defective airbag system is also life-threatening. A faulty airbag system will also cause problems during MOT inspections.
Prevention and maintenance tips for A5 owners
Check every time you start the car that the airbag warning light comes on briefly. The light should come on during the self-test and then go out again. Does the light stay on for more than a few seconds? Then schedule an inspection at the dealer immediately. Do not wait for the light to go out by itself, because the underlying fault will remain.
Avoid modifications to the seats: these can damage cables. Fitting seat covers, making electrical alterations and removing seats for cleaning can loosen or damage wiring. Leave this type of work to professionals. They know the correct way to handle airbag systems.
Do you own an A5 from 2018–2020? Then book a dealer check, even if you have not received an official recall notice. Not all owners received the letter. Your car may still fall under the recall. A quick check provides clarity and can save lives.
Always have the airbag system checked after a collision. This also applies after a minor bump. The airbags may not have deployed, but the system may still have suffered damage. A specialist erases the crash data in the module. The specialist also checks the sensors and recalibrates them: this means the sensors are adjusted precisely again to work correctly. Only then is the car fully safe again.
On the Carnews website you will find more information about known problems with Audi models, maintenance tips and experiences from other owners. Check the website regularly for up-to-date information about your car and practical tips to prevent faults.
Frequently asked questions
The most common airbag problems with an Audi A5 are faults in the seat heating cables that cause the passenger airbag to fail or be switched off. In addition, defective sensors, damaged wiring, loose connectors and faults in the airbag control module are common, usually visible as a lit airbag warning light. On older A5s there may also be problems with Takata airbags, where the airbag can tear or explode too violently when it deploys.
You can usually recognise symptoms of a faulty airbag system in your Audi A5 by a lit or flashing airbag or SRS warning light on the dashboard that does not go out after starting. Sometimes a specific fault message appears in the display, for example about the passenger airbag or an airbag sensor. The passenger airbag indicator (by the seat) switching on and off by itself can also point to a cable or sensor defect. If the airbag light stays on, always have the system read out as soon as possible with diagnostic equipment.
Yes, there have been specific recalls for the Audi A5 in connection with airbag faults. In particular, A5 models from around 2018–2020 are known to have a problem with the seat heating cable that interferes with the passenger occupancy detection system and can switch off the passenger airbag. In addition, some older A5 models may fall under the general Takata airbag recall. Owners have been contacted by Audi/the dealer and can have the repair (replacing cables/parts and updating software) carried out free of charge.
The cost of diagnosing an airbag fault in an Audi A5 is usually between about €50 and €150, depending on whether you go to a dealer or an independent garage and how much diagnostic time is needed. Minor repairs, such as repairing or replacing wiring or connectors under the seat, often cost around €150–€400 in total. If larger components need to be replaced, such as an airbag module, sensor mats or complete seat upholstery, the cost can rise to €500–€1,500 or more. When the fault falls under an official recall, diagnosis and repair are in principle free of charge at the franchised dealer.
Driving with a faulty airbag system increases the risk of serious injury or death in an accident, because one or more airbags may not deploy or may deploy uncontrollably. With known A5 problems, such as faults in passenger recognition or Takata airbags, the passenger airbag may be deactivated or may explode dangerously in a collision. This means that the core safety systems of the Audi A5 (airbags and sometimes seatbelt pretensioners) do not work as designed. As a result, the overall occupant protection of the car is significantly reduced.
Limited self-diagnosis is possible: you can check the airbag warning light and read fault codes with an OBD-II scanner. However, this only gives an indication and does not provide a structural solution. Because airbag problems directly affect safety and are often linked to recalls and specialist repairs, professional help is in practice essential. Do not continue driving with the airbag warning light on and have the system checked by an Audi dealer or approved workshop as soon as possible.