2018 Audi A5 Engine Problems
- Complaints
- 8about this part
- Share
- 21%of 38 total for the year
- Median mileage
- 9,550miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 8 complaints about the engine of the 2018 Audi A5, 21% of the 38 complaints for this model year. Where a mileage was given, the median is 9,550 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I am experiencing an oil leak, the car has 49000 miles and Audi has issued a TSB, yet upon my outreach to Audi North they are aware of the issue of leaks developing yet have not offered either warranty extensions or a recall yet.”
NHTSA complaint #11498640, filed 2022-12“My complaint is that Audi USA refuses to cover my damages and repair cost for the failed AC Evaporator that is covered under their warranty extension # AWA-21-01. Audi has a known issue for A/C Evaporator. The vehicle AC issue was immediately diagnosed by an independent mechanic who only diagnosed the issue and recharged the system until the Audi dealership had availability to inspect and perform the repair. Jim Ellis Audi was told of the issue and how using a sniffer tool the leak was found inside the cabin. …”
NHTSA complaint #11626977, filed 2024-11“The vehicle has 36000 miles on it and the oil cooler has failed. The car is meticulously maintained. This failure compromises the ability for the engine to cool properly. Because of the failure, coolant is then forced into the engine oil potentially destroying the engine. Engine replacements are 10,000 for these types of cars. Audi is aware of this issue and should repair all vehicles with this known issue”
NHTSA complaint #11676163, filed 2025-07“The contact owns a 2018 Audi A5. The contact stated that while driving at various speeds, the gears unexpectedly shifted. Additionally, on one occasion, the vehicle lost motive power for two full days. The vehicle was later able to restart. No warning lights were illuminated. The vehicle was taken to a local dealer, where the Engine Control Unit (ECU) was replaced; however, the contact stated that the failure recurred. The vehicle also experienced a loss of power steering. …”
NHTSA complaint #11496449, filed 2022-12, 16,000 miles“Large coolant leak due to faulty plastic thermostat and water pump which can cause overheating, catastrophic engine failure, and fire, putting consumers at risk. The thermostat housing has been replaced by the dealership, but not the water pump, just the water pump seal. There were no warnings prior to the failure, and was only diagnosed after a visual inspection under the vehicle.”
NHTSA complaint #11467989, filed 2022-06Related service bulletins
- 11034657Jun 26, 2026This bulletin provides information when there is increased oil consumption; >0.5ltr/1000 km.
- 11034728Jun 10, 2026This bulletin provides informaiton when the engine is not running smoothly, misfiring.
- 11034656Jun 4, 2026This bulletin provides information when DTC U140A00 Terminal 30 is stored in the ECM.
- 11029368Feb 20, 2026This bulletin provides information on the use of the Audi frequencly analysis app, and where the application can be downloaded.
- 11029367Feb 20, 2026This bulletin provides information on VIN Plates, Safety Certification labels, and the ordering procedures.
- 11028398Jan 14, 2026This bulletin provides information regarding UV leak additive for finding oil leaks.
- 11027356Dec 11, 2025This bulletin provides information when there is increased oil consumption; >0.5ltr/1000 km.
- 11026206Nov 25, 2025This special notice is to inform dealers to return the parts listed and only order the successor parts going forward.
- 11018973May 28, 2025This bulletin provides information when DTC U14A00 Terminal 30 is stored in the ECM.
- 11016532Mar 12, 2025This bulletin provides informatin when the engine does not run smoothly at idling speeds.
Engine: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 1 | 13% |
| 2024 | 1 | 13% |
| 2021 | 1 | 13% |
| 2018 | 8 | 21% |
| 2016 | 3 | 43% |
| 2015 | 1 | 13% |
| 2014 | 9 | 32% |
| 2013 | 12 | 34% |
| 2012 | 7 | 32% |
| 2011 | 6 | 24% |
| 2010 | 9 | 26% |
| 2009 | 1 | 9% |
Other parts of the 2018 Audi A5
8 complaintsBrakes
4 complaintsElectrical system
4 complaintsBody and structure
4 complaintsVisibility (wipers, defrost, mirrors)
4 complaintsAir bags
3 complaintsTransmission and drivetrain
3 complaintsSteering
2 complaintsSuspension
2 complaintsEngine cooling
1 complaintsExterior lighting
1 complaintsForward collision avoidance
1 complaints
← All problems reported for the 2018 Audi A5
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology