Free used car buyer guide / FY / FY facelift / 2018-2024
Audi Q5 common problems and best years
By BYBA Research - how we score cars
Updated 2026-06-12
BYBA Buy Score
5.0/10
5 walk-away risks, 3 serious faults, 1 minor fault documented for this generation, weighted by severity and repair cost. Biggest factor: gateway control module water ingress / power reduction recall. Score methodology.
The FY Q5 is a genuinely useful premium SUV, but its worst failures are hidden under trim: rear gateway water damage, panoramic roof drain leaks, EA888 coolant pump seepage, and PHEV high-voltage campaigns. The cheapest safe buy is usually a 2019-2021 45 TFSI quattro with completed 90S9 gateway work, dry rear electronics, a cold-dry coolant system and no S tronic parking-speed shudder. SQ5 buyers need separate EA839 cooling and ZF-service discipline, while diesel and PHEV buyers should only buy cars with clean emissions or high-voltage campaign paperwork. Owners should treat dampness, coolant top-ups and unexplained low-voltage module faults as one system, not three unrelated annoyances.
Faults covered
9
Highest risk
Gateway control module
Best years
2019-2021
Best buys
- 2019-2021 Q5 45 TFSI quattro with 90S9 gateway recall complete and documented water-pump history.
- SQ5 only with specialist inspection, clean coolant history and no tuned/neglected heat-soak evidence.
- Q5 PHEV only when high-voltage recalls, battery warranty and charging test all pass.
Inspect hard
- 2018 launch cars for gateway, sunroof drains, brake recalls and early electronics.
- Any panoramic-roof car for rear-floor, boot-side and under-seat dampness.
- Any S tronic 2.0 car for low-speed shudder and service/adaptation history.
Avoid
- Wet boot/rear carpet or gateway communication faults.
- Q5 with repeated coolant top-ups and no pressure-test invoice.
- PHEV with open battery/charging recall or EV mode unavailable.
Next checks
Before you contact the seller
Check the car's history first. Then bring the right tools if it still looks worth viewing.
Primary next step
Check history, title, and recall status
The faults above matter more if the car also has accident history, finance flags, missing service records, or open safety recalls.
Viewing kit
Bring the right tools
Four cheap tools catch most of the faults on this page at a Audi Q5 viewing.
Printable workflow
Take the inspection pack
The PDF is the ordered checklist for the viewing: documents, walk-around, test drive, and scan.
Open PDF optionSome links here are partner links. If you buy through one, BYBA earns a commission. The price you pay does not change. How we make money.
Engines and trims
Which Audi Q5 should you buy?
On most used cars, the engine and trim choice changes the risk more than the mileage does. Narrow this down before you start viewing cars.
45 TFSI 2.0 EA888
2018-2024
BEST MAINSTREAM BUY
This is the default Q5 engine and the one that fits the car best for mixed use. Its big mechanical story is the same EA888 coolant pump and thermostat housing risk found in A4/A5, with SUV heat and weight making cooling-system history more important than low mileage.
2.0 TDI EA288
2018-2024 Europe/UK
GOOD ONLY FOR MOTORWAY USE
The diesel Q5 is sensible for long-distance owners and poor for school-run mileage. SCR, NOx, EGR and DPF failures are not rare enough to ignore, and the used price must leave room for emissions work.
SQ5 3.0 TFSI EA839
2018-2024 in petrol markets
FAST BUT INSPECT HARD
The SQ5 is not just a Q5 with more power. The hot V6 packaging means coolant pump, thermostat, vacuum lines and turbo-area heat inspection matter, and repair pricing is closer to S4/S5 than to an ordinary family SUV.
Q5 55 TFSI e plug-in hybrid
2020-2024 depending market
BUY ONLY WITH HV PAPERWORK
The PHEV is excellent when charged at home and kept under warranty. It is a poor blind buy because high-voltage charging recalls, range loss and module faults require dealer-level scanning and written campaign status.
Year notes
Year-by-year buyer advice
Use this to narrow the search before you spend time travelling to view a car.
2018
FY Q5 launches widely; early brake, trim and water/electronics concerns matter most.
Buyer: Buy only after 90S9/gateway, brake recall, coolant and dampness checks. First-year price must compensate for inspection risk.
Owner: Keep drain and recall records; 2018 cars are now judged on proof, not age.
2019
Second full year; 45 TFSI and SQ5 supply broadens.
Buyer: Good value if dry and recall-clean. Spend time under the rear floor and on S tronic low-speed checks.
Owner: If AC, coolant or damp smells appear, diagnose immediately; waiting makes the story expensive.
2020
Pre-facelift matures; PHEV availability increases by market.
Buyer: For PHEV, test charge and scan HV modules. For petrol, coolant pump history is the key mechanical question.
Owner: Keep HV charging and coolant invoices together; they define resale confidence.
2021
Facelift/Sportback/PHEV mix expands; 90S9 recall covers many 2018-2022 Q5/SQ5 cars.
Buyer: A 2021 can be excellent, but only if gateway recall and software campaigns are closed.
Owner: Do not ignore rear-seat spills; the campaign exists because liquid can reach critical electronics.
2022
Facelift range settles; software, camera and gateway campaign exposure remains.
Buyer: Scan the full car. A late-looking Q5 with old gateway faults is not a clean late car.
Owner: Battery health and software updates prevent many false electrical trails.
2023
Late FY production; PHEV charging/battery campaign checks become more important.
Buyer: Prefer warranty-backed cars and insist on charging demonstration for PHEV.
Owner: Use warranty for every HV or charge-port warning before it expires.
2024
Final FY years before next model cycle; PHEV and late software recalls need VIN lookup.
Buyer: Do not pay nearly-new money without campaign printout and a clean scan.
Owner: Maintain campaign paperwork; late-car buyers will expect dealer proof.
Common problems
Faults to check before buying
What fails, what it looks like, what it costs, and the quick checks you can do at the viewing - ranked by how badly each one can hurt you.
Fault 1
Gateway control module water ingress / power reduction recall
Affects
2018-2022 Q5/SQ5 and 2021-2022 Q5/SQ5 Sportback in Audi 90S9 / NHTSA 21V947.
Symptoms
Reduced power, no-start, many warning lights, gateway communication faults, damp rear area.
Typical repair cost
EUR 0 recall; EUR 700-2,500 module diagnosis; EUR 5,000+ if harness/modules are corroded.
Codes / scan clues
Gateway U-codes and VAG communication faults; capture full scan.
Root cause: Liquid spill or water ingress reaches the gateway module and shorts the control unit.
Quick check
- Run VIN for 90S9 completion.
- Inspect rear seat/floor/boot for dampness.
- Scan all modules for communication history.
- Reject unexplained reduced-power or no-start stories.
Buyer note
This is the Q5 fault that can turn a clean SUV into a non-runner.
Owner note
Complete 90S9 and keep rear electronics dry; spills in the rear seat are not harmless.
Fault 2
Panoramic roof drain and rear electronics water damage
Affects
2018-2024 Q5/SQ5 with panoramic roof, especially 2018-2021 owner reports.
Symptoms
Damp headliner, wet boot side, battery drain, tailgate/light faults, module corrosion.
Typical repair cost
EUR 150-400 drain clean; EUR 600-1,500 dry/repair; EUR 2,500-10,000+ electronics.
Codes / scan clues
Multiple body/comfort/gateway communication and low-voltage faults.
Root cause: Blocked or detached roof drains route water into rear body/electronics areas.
Quick check
- Smell cabin and boot before ventilation runs.
- Inspect boot floor, side trim and rear carpets.
- Test tailgate, locks, lights, wipers and parking sensors.
- Avoid cars with dried water marks near electronics.
Buyer note
A wet Q5 is not a detailing problem; it is an electronics risk.
Owner note
Clean drains annually and investigate dampness the same week it appears.
Fault 3
2.0 TFSI coolant pump / thermostat housing leak
Affects
2018-2023 Q5 2.0 TFSI EA888, and related Audi 2.0T applications.
Symptoms
Low coolant, pink crust, heater issues, coolant smell, P00B7/P2181 style faults.
Typical repair cost
EUR 700-1,700; EUR 2,000-6,000+ if overheated.
Codes / scan clues
P00B7, P2181, P2185 cooling-performance faults.
Root cause: Plastic pump/thermostat housing and seals leak after heat cycling.
Quick check
- Check coolant level cold.
- Inspect undertray and pump area.
- Road test to full temperature.
- Ask for water-pump invoice or pressure-test result.
Buyer note
A free water-pump warranty repair is a plus only when the paperwork is specific.
Owner note
Do not keep topping up; pressure test and repair before overheating.
Fault 4
Engine mount leakage and vibration
Affects
2018-2024 Q5/SQ5, often 60k-120k km.
Symptoms
Idle vibration, D/R clunk, engine rock, hydraulic mount staining.
Typical repair cost
EUR 700-1,500 2.0T; EUR 1,200-2,500+ SQ5.
Codes / scan clues
Usually none; active mounts may store Audi-specific faults.
Root cause: Fluid-filled mounts collapse or leak under SUV weight and heat.
Quick check
- Watch engine movement at idle and D/R selection.
- Feel steering wheel vibration.
- Inspect mounts for wetness.
- Separate mount vibration from gearbox shudder.
Buyer note
Mounts are repairable; use them for price, not panic.
Owner note
Replace worn mounts before vibration accelerates exhaust and driveline wear.
Fault 5
S tronic hesitation, clutch adaptation or mechatronic faults
Affects
2018-2024 2.0 TFSI/TDI Q5 with 7-speed S tronic.
Symptoms
Launch delay, reverse thump, parking-speed shudder, hunting in traffic.
Typical repair cost
EUR 250-600 service/adaptation; EUR 1,000-2,500 mechatronic; EUR 3,000-7,000 major repair.
Codes / scan clues
VAG P17xx / gearbox pressure and adaptation faults; exact scan needed.
Root cause: Clutch adaptation wear, software, mechatronic or fluid degradation.
Quick check
- Cold launch and reverse parking test.
- Drive stop-start traffic.
- Scan gearbox module.
- Ask for gearbox service/adaptation history.
Buyer note
A heavy SUV makes low-speed DSG flaws obvious; do not accept 'normal' without scan.
Owner note
Service and adapt before clutch wear becomes a mechatronic bill.
Fault 6
SQ5 EA839 3.0T coolant and hot-V leaks
Affects
2018-2024 SQ5 3.0 TFSI, plus related B9 S4/S5 applications.
Symptoms
Coolant smell, low coolant, heat-soak staining, overheating under load.
Typical repair cost
EUR 900-2,000 cooling repair; EUR 2,500-5,500+ if multiple hot-V parts are involved.
Codes / scan clues
Cooling-performance and misfire faults vary; VAG scan required.
Root cause: V6 packaging heat ages pump, thermostat, coolant pipes and vacuum lines.
Quick check
- Inspect valley/front cooling areas.
- Check repeated coolant top-up history.
- Hot road test and post-shutdown smell check.
- Use Audi specialist PPI for SQ5.
Buyer note
Do not price SQ5 repairs like a 2.0 Q5.
Owner note
Shorter coolant and oil service intervals protect the EA839 better than long-life schedules.
Fault 7
Diesel AdBlue, NOx, EGR and DPF faults
Affects
European 2.0 TDI and SQ5 3.0 TDI FY cars.
Symptoms
AdBlue countdown, DPF warning, limp mode, failed emissions test.
Typical repair cost
EUR 350-900 NOx; EUR 700-1,700 AdBlue; EUR 900-2,500 EGR/DPF.
Codes / scan clues
P20EE, P204F, P229F, P2002 families.
Root cause: SCR/NOx ageing, AdBlue crystallisation, EGR fouling and DPF soot/ash load.
Quick check
- Scan engine and SCR modules.
- Check DPF soot/ash values.
- Confirm motorway-use history.
- Reject emissions-deleted cars.
Buyer note
A diesel Q5 needs evidence of the right usage pattern.
Owner note
Long hot runs and prompt NOx/AdBlue repair keep the system from cascading.
Fault 8
Q5 PHEV high-voltage battery and charging recalls
Affects
Q5 55 TFSI e / PHEV, mainly 2021-2024 recall populations.
Symptoms
Charging faults, reduced EV range, HV warning, instruction not to charge/park indoors.
Typical repair cost
EUR 0 recall; EUR 1,000-3,000 charger diagnosis; EUR 5,000-15,000+ battery module.
Codes / scan clues
Audi HV battery/charger manufacturer codes.
Root cause: Campaign-specific traction battery, charging cable or onboard charging concerns.
Quick check
- VIN check all HV recalls.
- Test AC charging.
- Scan HV and charger modules.
- Confirm battery warranty and campaign documents.
Buyer note
A PHEV that cannot prove clean HV status is not a cheap Q5.
Owner note
Use warranty for every charging warning immediately.
Fault 9
2018-2019 brake master cylinder / caliper recalls
Affects
Mainly 2018-2019 Q5/SQ5 recall populations, including 19V277 and 18V369.
Symptoms
Brake warning, long/soft pedal, uneven braking, recall notice.
Typical repair cost
EUR 0 recall; EUR 500-1,500 outside campaign.
Codes / scan clues
ABS/ESC hydraulic faults vary.
Root cause: Recall-specific brake hydraulic or caliper manufacturing defects.
Quick check
- VIN check 18V369 and 19V277.
- Confirm firm pedal before and after test drive.
- Check fluid level and brake warning lights.
- Reject active brake warnings.
Buyer note
A brake recall is simple when closed and unacceptable when vague.
Owner note
Keep brake campaign paperwork with the service book.
Inspection pack
Printable checklist for the viewing
The free page helps you decide whether the car is worth seeing. The paid guide is the ordered, printable checklist you use at the car.
- Audi campaign printout for 90S9 / gateway module.
- Coolant pump, thermostat or pressure-test invoices.
- PHEV high-voltage warranty and recall status if applicable.
- Gearbox service/adaptation records.
- Inspect boot floor, rear side panels and rear carpet for dampness.
- Check coolant cold and look below engine for pink residue.
- Check tyres for matching size/brand and SUV shoulder wear.
- Test MMI, reverse camera, tailgate, locks and parking sensors.
- Check for damp smell before HVAC runs.
- Verify no brake, airbag, drive-system or HV warnings.
- Cold S tronic launch and reverse parking.
- AC, coolant temperature and heat-soak smell check.
- Controlled brake pedal feel check.
- Full VAG scan: gateway, comfort, gearbox, engine, ABS, HV modules where fitted.
- Look for communication, undervoltage, cooling and gearbox history.
Bottom line
Buy: A 2019-2021 45 TFSI quattro with dry rear electronics, 90S9 completed, clean coolant history and smooth S tronic behaviour.
Avoid: Any wet Q5, any active gateway fault, any PHEV with unclear HV recall status, or any car with coolant loss plus no diagnosis.
Quick answers
Audi Q5 buyer questions
The short versions of what this page answers in full.
What are the most common Audi Q5 2018-2024 problems?
The highest-impact documented faults are: Gateway control module water ingress / power reduction recall; Panoramic roof drain and rear electronics water damage; 2.0 TFSI coolant pump / thermostat housing leak. This guide covers 9 faults in total, each with symptoms, typical repair costs, and checks you can do at a viewing.
Which Audi Q5 years are the best to buy?
2019-2021 stand out in this generation. A 2019-2021 45 TFSI quattro with dry rear electronics, 90S9 completed, clean coolant history and smooth S tronic behaviour.
Which Audi Q5 should I avoid?
Any wet Q5, any active gateway fault, any PHEV with unclear HV recall status, or any car with coolant loss plus no diagnosis.
Is the Audi Q5 2018-2024 a reliable used buy?
BYBA scores it 5.0/10 (cautious buy). 5 walk-away risks, 3 serious faults, 1 minor fault documented for this generation, weighted by severity and repair cost. Biggest factor: gateway control module water ingress / power reduction recall.
Get updates when this guide changes
Recalls get added, repair costs shift, and new fault patterns show up in the data. Leave an email and we'll tell you when the Audi Q5 guide gets a meaningful revision. Nothing else, no selling your address.
Research basis
- NHTSA recall lookup
- NHTSA 21V947 acknowledgement
- NHTSA 21V947 chronology
- OEMDTC 90S9
- Consumer Reports Q5 reliability
- CarComplaints 2018 Q5 electrical
- AudiWorld Q5 water thread
- Go-Parts EA888/Q5 pump guide
- NGP Racing EA839 guide
- Cars.com Q5 recalls
- Reddit Q5 water pump extended warranty report
- Q5 owner mount/water pump discussion
- CrewChief Audi Q5 problems
- Audi Q5 engine overview
- NHTSA Q5 2018 recall API