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2018 Audi A4 Recalls, Issues & Maintenance

The 2018 Audi A4 carries 1 open NHTSA recall — most recently covering seats. Owners report 6 recurring issue clusters, led by “Rear-view camera intermittent malfunction.” Audi follows the VW Group Longlife service rhythm: oil and minor service every 10,000 miles or 12 months, whichever comes first, using oil that meets VW 502 00 / 504 00 (or 508 00 for newer 0W-20 engines) — generic synthetic does not qualify. S tronic dual-clutch gearboxes need fluid service every 40,000 miles despite 'lifetime fill' claims. Fully electric models (e-tron, e-tron GT) skip oil service entirely but keep brake-fluid, cabin-filter, and coolant-circuit intervals.

1 Open Recall

Source: NHTSA

SEATS

Campaign #21V874000 · Oct 11, 2021

Issue: 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.

Fix: 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.

Recall data refreshed Sep 13, 2026.

Known issues for this vehicle

What drivers and federal regulators have officially reported about the 2018 Audi A4.

Reported to NHTSA

Rear-view camera intermittent malfunction

ELECTRICAL SYSTEM, UNKNOWN OR OTHER, BACK OVER PREVENTION

3 NHTSA complaints · 2023-04 → 2026-07

“The rear-view camera intermittently fails to engage when the vehicle is shifted into reverse. When the camera does display, the image sometimes shows horizontal glitch lines/artifacts”
— Owner report, NHTSA ODI #11747799
“When reversing, at times the back up camera does not function properly. During these times, the parking sensors appear to work, but it's unclear if the emergency reverse automatic braking system is working”
— Owner report, NHTSA ODI #11709539
“The rear view camera does not activate when using the parking assist or when reversing. The sensors are still functioning as intended”
— Owner report, NHTSA ODI #11515996

Read all complaints on NHTSA →

Water pump failure and coolant loss

ENGINE AND ENGINE COOLING

4 NHTSA complaints · 2022-02 → 2026-07

“The contact owned a 2018 Audi A4. The contact stated that while driving at an undisclosed speed, there was fluid leaking from the front of the vehicle”
— Owner report, NHTSA ODI #11717605
“Water Pump prematurely failed. Upon self inspection, I noticed the coolant reservoir was below the minimum requirements”
— Owner report, NHTSA ODI #11489365
“I received a message on my dashboard to turn the engine off and check the coolant when starting the vehicle each morning for the last two days”
— Owner report, NHTSA ODI #11452846

Read all complaints on NHTSA →

Powertrain component failure

POWER TRAIN

4 NHTSA complaints · 2020-08 → 2026-07

“A vehicle diagnostic scan dated 04/15/2026 at approximately 88,502 miles showed a stored transmission electronics fault: P084100, described as “Transmission fluid pressure sensor/switch A range/performance,” with status listed as passive/sporadic”
— Owner report, NHTSA ODI #11747862
“The all-wheel-drive clutch in the vehicle had to be replaced. The symptoms were heavy vibrations or thumping when starting to drive forward from a stop with the wheels turned in either direction”
— Owner report, NHTSA ODI #11547846
“While driving there was an internal failure of the front differential which caused debris to fly out and the debris then punctured the transmission according to the diagnosis on an Audi dealership”
— Owner report, NHTSA ODI #11539793

Read all complaints on NHTSA →

Forward collision avoidance false activation

FORWARD COLLISION AVOIDANCE

3 NHTSA complaints · 2022-06 → 2026-06

“I am reporting recurring safety-related defects on my 2018 Audi A4 involving Automatic Emergency Braking, Forward Collision Warning, Audi pre sense/front-collision functionality, and related electrical/driver-assistance reliability”
— Owner report, NHTSA ODI #11741957
“The Audi Pre-sense engaged on 3 occasions going 50+ mph bringing the car to a complete stop when there was nothing in front if it and a car right behind me”
— Owner report, NHTSA ODI #11471528
“The forward collision warning system (Audi PreSense) identified a shadow from an overpass as another car and alerted me to use the brakes”
— Owner report, NHTSA ODI #11469403

Read all complaints on NHTSA →

MMI infotainment spontaneous restart

UNKNOWN OR OTHER

3 NHTSA complaints · 2025-07 → 2025-12

“My car's MMI keeps restarting while driving which affects the rear view camera and while backing up it can restart and go completely blank”
— Owner report, NHTSA ODI #11684505
“The Audi MMI system began to spontaneously restart while driving after owning the car for a couple of years”
— Owner report, NHTSA ODI #11675417
“My screen turns on and off consistently not allowing me to use my backup camera. Causing a small collision while backing up when the camera turned off unexpectedly”
— Owner report, NHTSA ODI #11702346

Read all complaints on NHTSA →

Passenger airbag occupant-detection recall incomplete

AIR BAGS

4 NHTSA complaints · 2023-03 → 2026-07

“The vehicle is subject to a Passenger Occupant Detection System / PODS safety recall involving the front passenger seat occupant-detection system and passenger airbag status”
— Owner report, NHTSA ODI #11747852
“I first received notice of this recall in 1/22. My Audi dealer has continuously stated that Audi does not send them enough kits to remedy this recall”
— Owner report, NHTSA ODI #11524991
“After dealership did the second repair to the airbag recall, the airbag light came on and has been on solid”
— Owner report, NHTSA ODI #11511483

Read all complaints on NHTSA →

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 13, 2026. Investigation data refreshed Sep 13, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Essential maintenance

Critical for safety and preventing major damage

Engine Oil & Filter (Longlife Service)

Every 10,000 mi

Replace oil and filter every 10,000 miles or 12 months with VW 502 00 / 504 00 / 508 00 spec oil. S and RS models driven hard: many owners shorten to 5,000-7,500 miles. Wrong-spec oil is the leading cause of TFSI timing-chain tensioner and PCV problems.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

Tire Rotation

Every 10,000 mi

Rotate every 10,000 miles with the oil service. quattro models: keep all four tires within 4/32" of each other — mismatched wear stresses the center differential.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

Brake Inspection

Every 10,000 mi

Inspect pads, rotors, and wear sensors every 10,000 miles. Audi uses electronic pad-wear sensors on most models — replace the sensor with the pads.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

Brake Fluid

Every 24,000 mi

Replace DOT 4 brake fluid every 2 years regardless of mileage — Audi's published schedule is time-based because the fluid absorbs moisture.

Estimated cost — typical U.S. ranges

Dealer

~$180–$200

Shop

~$125–$140

DIY

~$10–$25

DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.

S tronic Dual-Clutch Fluid

Every 40,000 mi

S tronic (DSG) gearboxes on A3/S3/RS 3, Q3, TT, and many A5/Q5 models: replace fluid and filter every 40,000 miles with the VW Group-spec fluid for your gearbox code. Skipping this service is the most common cause of mechatronic failure.

Estimated cost — typical U.S. ranges

Dealer

~$470–$640

Shop

~$330–$450

DIY

Pro only

VW/Audi DSG service needs a fluid-fill procedure at a specific temperature — shop equipment territory.

Important maintenance

Keeps your vehicle running smoothly and efficiently

quattro Coupling Fluid (Transverse Models)

Every 40,000 mi

A3/S3/RS 3, Q3, and TT use a Haldex-style rear coupling: replace its fluid roughly every 40,000 miles (some model years specify sooner — check your manual). Longitudinal quattro (A5-A8, Q5, Q8) has no coupling service; see differential fluid instead.

Estimated cost — typical U.S. ranges

Dealer

~$220–$290

Shop

~$155–$205

DIY

~$40–$90

VW/Audi/Volvo AWD coupling — specific fluid required. Filter usually swapped at the same time.

Spark Plugs

Every 40,000 mi

TFSI turbo engines: new plugs every 40,000 miles. RS models with the 2.5 TFSI five-cylinder: consider 30,000 miles under track or hard street use.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

Engine Air Filter

Every 40,000 mi

Replace every 40,000 miles; inspect at 20,000 on turbocharged engines — a clogged filter shows up as sluggish boost response first.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

Timing Chain (EA888 — Inspect Tensioner)

On condition / lifetime

2.0 TFSI (EA888) engines before roughly 2013 had timing-chain tensioner failures — have the tensioner revision checked by 80,000 miles on earlier cars. Later engines carry the updated design with no scheduled service.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Pro only

Timing chains are normally lifetime. Listen for rattle on cold start — that's the actionable signal. Replacement is major work, quote separately.

Recommended maintenance

Extends the life of your vehicle and improves comfort

Differential Fluid (Longitudinal quattro)

Every 60,000 mi

Q5, Q8, and A5-A8 quattro: independent Audi specialists recommend front/rear differential fluid service around 60,000 miles even where Audi lists it as lifetime fill.

Estimated cost — typical U.S. ranges

Dealer

~$150–$195

Shop

~$105–$135

DIY

~$20–$50

Drain plug + fill plug — straightforward DIY. AWD vehicles have two; budget for both.

Dust & Pollen Filter

Every 20,000 mi

Replace the cabin air filter every 20,000 miles or 2 years. Audi specifies an activated-carbon filter on most models.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

G12evo / G13 Coolant

On condition / lifetime

Audi coolant is labeled lifetime fill. Independent VW/Audi specialists recommend a refresh around 5 years or 100,000 miles to protect the water pump and thermostat housing — and only with the correct pink/lilac VW Group coolant.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

5 crashes 2010–2024

FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number

Owner-reported problem signals

Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.

1

complaints mentioning a crash

0

complaints mentioning a fire

Reviewed known issues for this vehicle·Open recalls for this vehicle

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2018 Audi A4 reflects Audi's published service intervals and the Audi Service Interval Display system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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