2018 AUDI A5 Problems

Complaints Reported

Complaints by Component

ENGINE

2 complaints

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

Jul 25, 2025

Engine shuts off occasionally whilst cornering at very low speed. No warning. Been happening for several years.

Jun 25, 2025

ENGINE AND ENGINE COOLING

1 complaint

I own a 2018 Audi A5. Many critical cooling system parts — including the thermostat housing, water pump housing, radiator end tanks, breather tubes, and quick-connect hoses — are made of plastic and sit in constant exposure to coolant temperatures over 200°F. Over time, these components become brittle, crack, and fail prematurely. Recently, the plastic breather/return hose between the coolant reservoir and the radiator broke apart during routine service due to brittleness. When these parts fail, coolant leaks quickly, which can cause sudden overheating, engine damage, and potential vehicle disablement while driving. Based on owner reports and my own experience, this appears to be a widespread issue across Audi/VW vehicles of this generation. I request that NHTSA investigate whether the use of plastic in these high-heat, high-pressure components represents a design defect that creates a safety hazard.

Sep 29, 2025

POWER TRAIN

1 complaint

The water pump failed on my vehicle. Initially reported 2/2025 at Authorized Audi Service Center. They claimed it was normal for coolant to dip. Audi USA Confirmed I have a settlement class vehicle in 03/2025. Mentioned an 80K Mileage limit. (Car only had 69K miles at the time) When the issue persisted I reached out for repair in accordance to Water Pump Settlement. McKenna Audi Service center initially stated the extended warranty expired 05/2025, and mentioned an 8 Year Limit (8/80K whichever comes first) 9/3 Reached out to Audi USA again and they initially provided an approval. Instructed to take to authorized service center for official diagnosis. 9/5 Audi USA recanted approval 2 days later. Instructed to Call Settlement Administrator. SA stated this is fully Audi responsibly warranty does not expire until 9/2025 unable to assist. Spoke to supervisor at Audi USA who stated extended warranty did not expire until 09/26/2025 09/08 Audi Beverly Hills confirmed water pump malfunction. Sent invoice to supervisor at Audi USA. $2338.25 Supervisor informed me later that warranty is expired after all. Stated a regional manager would look at it but no guarantees. At this point I have spent $350 for a diagnosis I did not need to satisfy the demands of the Audi warranty that is now being denied.

Sep 08, 2025

⭐

4.4/5.0

71 reviews

Frequently Asked Questions

How many problems does the 2018 AUDI A5 have?

The 2018 AUDI A5 currently has 4 owner-reported complaints according to NHTSA database. These complaints are organized by component to help identify common issues.

What are the most common problems with 2018 AUDI A5?

The most common problems reported for the 2018 AUDI A5 are organized by component above. Each component section shows owner-reported issues, crash reports, and fire incidents to help identify patterns and problem areas.

Where does this 2018 AUDI A5 problem data come from?

All problem and complaint data for the 2018 AUDI A5 comes directly from the National Highway Traffic Safety Administration (NHTSA) database. These are real complaints submitted by actual vehicle owners.