AI Damage2018 Audi A4: common problems
Owners of the 2018 Audi A4 filed 43 complaints with NHTSA, most often about electrical system and structure. The maker issued 763 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 43
- involving a crash
- 1
- Technical service bulletins (TSB)
- 763
What fails most often
- 1 Electrical system 37% of all complaints
- 2 Structure 14% of all complaints
- 3 Fuel/propulsion system 14% of all complaints
- 4 Powertrain 12% of all complaints
- 5 Engine 12% of all complaints
- 6 Air bags 9% of all complaints
- 7 Forward collision avoidance 9% of all complaints
- 8 Service brakes 7% of all complaints
- Electrical system: 16 complaints (37% of all); manufacturer bulletins for this component: 189.
- Structure: 6 complaints (14% of all); manufacturer bulletins for this component: 74.
- Fuel/propulsion system: 6 complaints (14% of all); manufacturer bulletins for this component: 7.
- Powertrain: 5 complaints (12% of all); manufacturer bulletins for this component: 51.
- Engine: 5 complaints (12% of all); manufacturer bulletins for this component: 33.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 2 L · petrol · turbo · 4 cyl
- dual-clutch (DCT), 7-speed
- manual, 6-speed
Drive: AWD, FWD
Symptoms owners describe
How many of the 43 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 16 | 0 | 189 |
| Structure | 6 | 0 | 74 |
| Fuel/propulsion system | 6 | 0 | 7 |
| Powertrain | 5 | 0 | 51 |
| Engine | 5 | 0 | 33 |
| Air bags | 4 | 0 | 10 |
| Forward collision avoidance | 4 | 0 | 4 |
| Service brakes | 3 | 0 | 42 |
| Suspension | 2 | 0 | 44 |
| Backover prevention | 2 | 0 | 9 |
| Steering | 1 | 1 | 47 |
| Engine and cooling | 1 | 0 | 42 |
| Visibility | 1 | 0 | 31 |
| Wheels | 1 | 0 | 18 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
I was rear-ended at a slow speed. I was stopped at the time. The driver who hit me was decelerating hard. Damaged to rear bumper. When I got back in the car, I realized that telescoping steering column had been pulled toward me.
I am reporting a serious vehicle safety incident involving my 2018 Audi A4. On XXX, while traveling from [XXX] to [XXX] with my [XXX] son in the vehicle, all four tire valve stems failed during a single interstate journey. The first failure occurred on the front-left tire, causing nearly instantaneous tire deflation.
No crash, fire, injury, or fatality occurred. The vehicle/component is available for inspection, and the diagnostic scan report, electrical-system records, service communications, and related repair records are available if requested.
This is being reported as a safety concern because a transmission fluid pressure sensor or transmission-control fault can affect shifting, drivability, delayed engagement, slipping, harsh shifting, limp mode, reduced power, drivetrain damage, or loss of propulsion while driving.
No crash, fire, injury, or fatality occurred. This complaint is being submitted because the rear camera/reverse display is a backing-safety system and the intermittent failure is unpredictable. The vehicle/component is available for inspection, and photo/video evidence and service communications are available.
It may involve abnormal oil consumption, an external oil leak, internal engine oil consumption, PCV/oil separator issue, turbo-related oil consumption, gasket/seal issue, or oil loss that is not leaving an obvious visible puddle.
The concern is being reported because the coolant loss/refill issue continued or remained unresolved afterward. The exact source of coolant loss is unknown, but it may involve the water pump, thermostat, coolant reservoir, coolant hoses/pipes, pressure loss, internal coolant leak, or coolant loss that evaporates…
This creates a safety risk because load-rated tires affect vehicle stability, heat buildup, braking, steering/cornering, suspension loading, and tire failure/blowout risk.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 934 of 2,102 model years in the NHTSA data (top 44% most complained about).
On average one model year of the A4 has 16 complaints (11 years in the data). This year has 43, above average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- This bulletin states that technicians are required to report to the manufacturer when a vehicle has…
This bulletin states that technicians are required to report to the manufacturer when a vehicle has flooded, and specify the height to which the vehicle has been flooded.
- This bulletin provides information regarding fault finding and repair information for electric tailgate
- This bulletin provides information about billing for a broken sunroof glass panel
- This bulletin provides information about vibrations and rotational steering vibrations
- This TSB describes a corrosion issue due to outside influence and the prohibition of warranty in these cases
- This bulletin provides information for reporting safety related information to the manufacturer
- This bulletin provides infomraiton abou the Audi frequency analysis application, which is available in the…
This bulletin provides infomraiton abou the Audi frequency analysis application, which is available in the App Store for Android and Apple phones.
- This bulletin provides information when the license plate mounting bracket threded inserts are stripped
- This bulletin provides service information regarding exterior glass cleaning
- This bulletin provides informaiton when the airbag warning lamp is active, event memory "B200000 - Faulty…
This bulletin provides informaiton when the airbag warning lamp is active, event memory "B200000 - Faulty control module, symptom 305".
- This bulletin provides information when there is a paint issue on alloy wheels
- This service information TSB provides warranty coverage information for vehicles with a broken sunroof panel
NHTSA lists 763 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2018 Audi A4?
Owner complaints to NHTSA most often mention: electrical system, structure, fuel/propulsion system. Total complaints: 43. The most frequent symptoms in complaint texts: smoke, burning smell, fire (35%), warning lights, check engine (14%), rear-view camera (12%).
How many service bulletins (TSB) were issued for the 2018 Audi A4?
NHTSA lists 763 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2018 Audi A4 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2018 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.