This bulletin provides information when there is increased oil consumption; >0.5ltr/1000 km.
full bulletin at NHTSA ↗2018 Audi Q7 engine problems
moderate Owners of the 2018 Audi Q7 have filed 31 NHTSA complaints about the engine at roughly $3,100 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See engine across all vehicles →
Complaints
31
Recalls
0
Avg fix
$3,100
| Model year | engine complaints |
|---|---|
| 2014 Q7 | 3 |
| 2015 Q7 | 10 |
| 2017 Q7 | 42 |
| 2018 Q7 (this page) | 31 |
| 2019 Q7 | 3 |
| 2020 Q7 | 7 |
| 2021 Q7 | 7 |
1crash
What stands out
Owners have filed 31 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Among the 10 model years of Audi Q7 in our records for engine problems, this one ranks #2 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides informaiton when the engine is not running smoothly, misfiring.
full bulletin at NHTSA ↗This bulletin provides information when DTC U140A00 Terminal 30 is stored in the ECM.
full bulletin at NHTSA ↗This bulletin provides informatio when fuel pump/ sender, fuel tank level implausible, DTC B105A1A B103E29 Stored in 0017.
full bulletin at NHTSA ↗This bulletin provides informaiton when the radiator fans run constantly and the windshield wipers don't work.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report that 2018 Audi Q7 engines—particularly the 3.0T—burn through oil at alarming rates beginning around 56,000–60,000 miles, requiring quart additions every 200–700 miles despite following Audi's maintenance schedule religiously. Multiple narratives describe replacing the PCV and CCV valve systems without stopping the consumption. Several owners cite defective piston rings and piston assemblies as the culprit, with some oil passing directly into cylinders and combustion chambers.
The excessive oil burn degrades engine internals. Owners report fouled spark plugs, coils, and sensors, followed by cylinder misfire warnings and sudden loss of power while driving—hazardous on highways. Some found exhaust valves had broken and fallen into cylinders, scoring walls and requiring full cylinder head work or complete engine replacement.
Water pumps fail prematurely on many of these vehicles, sometimes under 20,000 miles, causing rapid coolant loss and overheating risk. Thermostat failures also occur and are not always covered by warranty.
Owners mention a pending or settled class action lawsuit over piston rings and Audi's limited remedies—partial repair assistance in a few cases, but no recalls. One owner reports acceleration hesitation during traffic maneuvers, which the dealer called normal. Multiple narratives cite repair estimates of $8,000 to $26,000 for engine work, often exceeding the used-car value.
Same Audi Q7 engine reports on nearby years: 2015 · 2017
Failure modes owners describe
Excessive oil consumption / Piston ring defect
Engine consumes oil at abnormally high rates starting around 56,000–60,000 miles, requiring frequent top-offs between service intervals. Owners report needing to add a quart every 200–700 miles. Root cause alleged to be defective piston rings and piston assemblies that allow oil to burn in cylinders and pass into the combustion chamber. Multiple owners report following all Audi maintenance standards and replacing CCV/PCV valves without resolution.
When: Typically begins 56,000–60,000 miles; progressively worsens with mileage
Symptoms owners cite: Check engine light / low oil warning illuminates; Frequent need to add oil between service intervals; Oil consumption rates of 1 quart per 200–700 miles; Fouled spark plugs, coils, injectors, sensors (from excessive oil burn); Cylinder misfire notifications; Piston slapping noise (in at least one case); Engine sputtering and laboring
Codes mentioned: P0300 (cylinder misfire - reported by multiple owners), P0301 (cylinder 1 misfire), Low oil level codes
Repairs/costs cited: Owners cite costs for engine replacement ranging from $12,000 to $26,000+; some dealers recommended full engine rebuild/replacement. CCV valve and PCV breather replacement attempted by some owners without lasting resolution.
Recalls/TSBs owners mention: Class action lawsuit filed. Audi sent letters/emails to certain owners acknowledging the issue and offering limited assistance (e.g., 40% of repair costs). Audi aware of defect in 2017–2023 Q7 models but has not recalled; some owners report warranty extension letters issued for affected vehicles, though not consistently.
Exhaust valve failure / Internal engine damage
One or more exhaust valves fail during operation, often breaking and falling into the combustion chamber. This causes cylinder wall scoring, piston damage, and catastrophic internal engine failure. Multiple owners experienced this failure coinciding with or resulting from excessive oil consumption.
When: 68,000–86,000 miles (in reported cases)
Symptoms owners cite: Drive system malfunction warning; Check engine light; Loss of power while driving (sudden or immediate); Engine stalling or barely idling; Cylinder misfire; Car vibration; Inability to accelerate
Codes mentioned: Drive system malfunction codes, P0300 or cylinder-specific misfire codes
Repairs/costs cited: Repair estimates cited: $8,032.99 for removal of cylinder heads, replacement of all exhaust valves, cleaning of pistons and combustion chambers; $12,000 for broken exhaust valve repair plus related components. Multiple owners reported engine replacement as the only viable solution.
Recalls/TSBs owners mention: Audi offered partial assistance in at least one case (40% of repair cost). No recalls issued. Dealers have acknowledged the issue in some cases.
Water pump failure / Premature coolant loss
Water pump fails or corrodes much earlier than typical service life (normally expected around 100,000 miles). Pump seals corrode and leak, causing rapid coolant loss and potential engine overheating. Issue reported on vehicles with as few as 20,000 miles.
When: 20,000–56,600 miles (reported cases); typically well before 100,000-mile service life
Symptoms owners cite: Low engine coolant warning light; Rapid coolant loss from reservoir; Burning coolant smell; Engine overheating risk
Codes mentioned: Low coolant level codes
Repairs/costs cited: Water pump replacement costs cited: $961.07 (independent shop), $1,375 (6,600 miles out of warranty). Owners state this should not be a required repair until 100,000 miles.
Recalls/TSBs owners mention: No recall issued. Audi aware of this issue; class action lawsuit exists for some Audi/VW models, but 2018 Q7 Prestige 3.0 not included. Warranty typically does not cover water pump repair on vehicles out of warranty.
PCV valve / Crankcase system defect
PCV valve and associated crankcase ventilation components develop defects, causing pressure buildup and contributing to the broader excessive oil consumption issue. One owner reports loud whistle noise from the engine tied to crank case valve/oil separator problems.
When: Common across 2017–2023 Q7 models; timing of failure not specified in narratives
Symptoms owners cite: Low oil warnings; Loud whistle noise from engine; Dashboard malfunction lights (parking brake alert, drive system malfunction, start-stop malfunction); Multiple random malfunction alerts
Repairs/costs cited: One narrative lists parts for repair: bolt, trim, repair kit, gaskets, tubes, washer. Repair costs described as 'thousands of dollars' but specific amounts not provided.
Recalls/TSBs owners mention: Audi aware of issue; no recall issued despite reports of widespread complaints (one owner cites Reddit thread with 'thousands of people' reporting the same problem). Issue not addressed in warranty programs.
Acceleration hesitation / Drive system responsiveness
Engine hesitates when accelerating, delaying vehicle response to throttle input. Occurs when attempting to cross traffic or merge. Audi dealership deemed the symptom 'normal' and offered no permanent fix.
When: Not specified by mileage in narrative
Symptoms owners cite: Hesitation before acceleration engagement; Delayed vehicle response to gas pedal; Slower acceleration than expected at higher speeds
Repairs/costs cited: No repair performed. Dealer suggested using 'Sport' mode to improve response; owner found this is a workaround, not a fix.
Recalls/TSBs owners mention: Dealership acknowledged issue but classified as normal operation. No remedy offered.
Thermostat / Cooling system component failure
Thermostat failure requiring replacement, often discovered alongside coolant loss issues. Repair costs exceed warranty coverage.
When: Reported on vehicle with 74,956 miles at time of complaint
Symptoms owners cite: Coolant level warning light
Repairs/costs cited: Repair cost cited: over $2,100. Extended warranty did not cover thermostat (only water pump covered).
Recalls/TSBs owners mention: Warranty coverage limited; no recall or service program mentioned.
Synthesized from 31 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Engine coolant leak reported only at around 30K miles. Leak detected and fixed at owners cost.
Had engine trouble with your 2018 Audi Q7?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2018 Audi Q7?
It's a documented issue but not catastrophic. 31 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Based on the 31 complaints filed, engine issues most often appear around 33,333 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2018/Audi/Q7.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.