YearToAvoid

2018 Audi A4 Problems, Recalls & Reliability

Verdict

Avoid

Complaint Index

79/100

#4 most-complained of 15 A4 years

The 2018 Audi A4 has 44 NHTSA complaints and 1 recall, with a complaint index of 79, ranking it 4th worst out of 15 model years. Compared to other A4 years, this makes 2018 an Avoid year, driven mainly by electrical system complaints.

Complaints
44
Recalls
1
Crashes / fires
1 / 0
Injuries / deaths
0 / 0
NHTSA overall rating
5 / 5 ★
EPA combined MPG
27
24 city / 34 hwy

Top 2018 Audi A4 problems

NHTSA owner complaints by component group. Groups with 15+ complaints have their own page.

  1. Other18 (41%)
  2. Electrical System17 (39%)
  3. Structure & Body7 (16%)
  4. Engine6 (14%)
  5. Collision Avoidance & Cameras6 (14%)
  6. Fuel System6 (14%)
  7. Brakes5 (11%)
  8. Transmission & Powertrain5 (11%)
  9. Airbags4 (9%)
  10. Suspension, Wheels & Tires2 (5%)

What owners report

  • Some drivers reported the telescoping steering column being pushed toward them during a rear-end collision.
  • New factory brakes reportedly made a loud screeching sound near a complete stop even after dealership replacement attempts.
  • Owners described the electronic parking brake engaging on its own without warning, causing an abrupt stop.
  • The forward collision warning system reportedly misread shadows or overpasses as obstacles and triggered unnecessary emergency braking at highway speeds.
  • One owner reported an engine malfunction causing hesitation and lag that required multiple repair attempts without resolution.
  • A water pump reportedly failed prematurely, dropping coolant levels below the minimum before being caught during a self-inspection.
2018 Audi A4 complaints: complaints filed per month40Nov 2019Feb 2022Mar 2023Oct 2023Aug 2024Oct 2025Jun 2026
78 complaints filed with NHTSA from Nov 2019 to Jul 2026; peak Jul 2026 (40).

2018 Audi A4 recalls

1 NHTSA recall campaign list this model year.

  1. NHTSA 21V874000Nov 10, 2021Airbags208,332 vehicles

    Air bags:sensor:occupant classification:front passenger

    Volkswagen Group of America, Inc. (Audi) is recalling certain 2017-2020 A4 Allroad, A4 Sedan, 2018-2019 RS5 Coupe, 2019 RS5 Sportback, 2018-2020 A5 Cabriolet, A5 Coupe, A5 Sportback, S4 Sedan, S5 Cabriolet, S5 Coupe, and Audi S5 Sportback vehicles. The cable connecting the seat heater to the Passenger Occupant Detection System (PODS) may have a contact fault, causing the software to misdiagnose a malfunction and disable the passenger air bag.

    Risk: A disabled passenger air bag increases the risk of injury in the event of a crash.

    Remedy: Dealers will replace the connecting cable and either the heating mat or entire seat cover, free of charge. Owner notification letters were mailed January 7, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 74E3. This recall is an expansion of Recall 19V-547 (74D9). Vehicles previously repaired under 19V-547 will need to return for the new remedy.

2018 Audi A4 fuel economy and fuel cost

City
24 MPG
Highway
34 MPG
Combined
27 MPG
Annual fuel cost (EPA)
$2,950
15,000 mi/yr
Fuel
Premium
Current regular gas
$4.32/gal
national avg.

EPA figures; median across configurations of this model year. Estimate your own cost with the fuel cost calculator.

2018 compared with other A4 years

Complaint Index by model year (0 = fewest issues, 100 = most)0255075100’10’11’12’13’14’15’16’17’18’19’20’21’22’23’24
Complaint Index: 0 = fewest issues, 100 = most, relative to other years of this model. Avoid Caution Good Best
YearVerdictIndexComplaintsRecallsMPG
2016Best2111026
2017Avoid8655127.5
2018Avoid7944127
2019Caution5010128.5
2020Avoid100127328.5

All Audi A4 years: best and worst →

Frequently asked questions

Is the 2018 Audi A4 reliable?
Based on NHTSA owner complaints and recalls, the 2018 A4 has a complaint index of 79 and ranks 4th worst among 15 model years, earning an Avoid verdict relative to other A4 years.
What are the most common problems with the 2018 Audi A4?
Electrical system complaints make up 39% of reports, the largest share, followed by structure and body issues at 16% and engine, collision avoidance, and fuel system complaints each at 14%.
Does the 2018 Audi A4 have any recalls?
NHTSA lists 1 recall for the 2018 A4, covering an airbag component involving the seat heating mat and cover; it is not a do-not-drive recall.
How does the 2018 Audi A4 compare to other years?
The 2018 A4 has a complaint index of 79, higher than years like 2016 (21) and 2022 (14), which are rated Best, but lower than 2020 (100), which has the worst complaint index among A4 years.
What mileage do 2018 Audi A4 problems typically show up at?
The median mileage at failure across all reported issues is 12,000 miles, though specific problem areas vary, such as structure and body issues at 10,000 miles and engine issues at 53,000 miles.

Sources: NHTSA Office of Defects Investigation complaint and recall databases; U.S. EPA fuel economy data; NHTSA 5-Star Safety Ratings. Complaints are unverified owner reports.

Data updated Sep 24, 2026. Read the methodology and data sources. The Complaint Index is based on NHTSA owner complaints and recalls; it is not a reliability rating.