The 2021 SQ5 with EA839 3.0T V6 is relatively new, but shares core architecture with problematic MLB Evo platforms. Early-build engines show catastrophic failure patterns from oil consumption/carbon buildup, and the 8-speed ZF transmission has specific cooling and mount issues that appear prematurely.
EA839 Engine Catastrophic Failure - Piston Ring Lands/Bore Scoring
Occasional · high severity
Typical onset: 30,000-70,000 mi
Symptoms: Excessive oil consumption (1qt per 1,000 mi or worse), Cold-start misfires or rough idle with white/blue smoke, Check engine light for multiple misfires or fuel trim codes, Metallic knocking or rattling from crankcase under load
Fix: Complete engine rebuild or short block replacement required. 35-45 labor hours for R&R and reassembly. Carbon buildup on intake valves often masks early symptoms until ring land failure occurs. Some warranty extensions exist for early VINs, but 2021s fall into gray area.
Estimated cost: $18,000-28,000
ZF 8HP Transmission Oil Cooler Failure
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid in coolant (strawberry milkshake in expansion tank), Coolant in transmission pan (white frothy ATF), Harsh or delayed shifts, limp mode, Overheating warnings on dash
Fix: Replace internal oil cooler in radiator assembly, flush entire cooling system and transmission, replace ATF and filter. Cross-contamination often requires transmission rebuild if caught late. 8-12 labor hours if trans survives, 25+ if rebuild needed.
Estimated cost: $2,800-5,500
Transmission Mount Collapse (Rear Mount Specifically)
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Clunk or thud on 1-2 or 2-3 shifts, especially under throttle, Vibration at idle in Drive that disappears in Park/Neutral, Visible sagging or torn rubber on inspection from below
Fix: Replace rear transmission mount. Requires subframe support but not full trans drop. 2.5-3.5 labor hours. OEM mount mandatory—aftermarket versions fail within 10k miles.
Estimated cost: $650-950
Carbon Buildup on Intake Valves (Direct Injection)
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Rough cold starts that smooth out after 30 seconds, Hesitation or stumble at part-throttle 2,000-3,000 RPM, Misfires on specific cylinders (P030X codes), Loss of power compared to new
Fix: Walnut blasting intake valves. Remove intake manifold and hand-clean each port. 6-8 labor hours. Required every 60-80k miles on these DI-only engines (no port injection to self-clean).
Estimated cost: $800-1,200
Rear Seatbelt Retractor Recall Compliance Issue
Occasional · medium severity
Symptoms: Rear seatbelt fails to retract or locks up randomly, NHTSA recall 21V-939 issued for specific build dates, No warning light—purely mechanical failure
Fix: Dealer-only recall repair. Replace rear seatbelt retractor assemblies. 1.5-2 labor hours per side. Covered under recall—verify completion before purchase.
Estimated cost: $0
Coolant Thermostat Housing Leak (Upper Housing)
Occasional · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Coolant weeping from thermostat housing at engine front, Sweet smell from engine bay, visible drips on skid plate, Slow coolant loss without external puddles (evaporates on hot engine), Eventually triggers low coolant warning
Fix: Replace thermostat housing and coolant temp sensor (integrated unit). Requires partial front-end disassembly for access. 4-5 labor hours including coolant flush and bleed.
Estimated cost: $900-1,400
Owner tips
Check oil level EVERY fill-up for first 50k miles—catch ring land issues before catastrophic failure
Walnut blast intake valves at 60k and 120k preventively, not when misfires start
Use only Audi-approved 0W-20 oil (VW 508/509 spec)—aftermarket 'equivalents' accelerate carbon buildup
Verify all recalls completed (especially seatbelt 21V-939) before purchase—check NHTSA database by VIN
Inspect transmission cooler and mounts at every service—both are predictable failures on this platform
Buy only with full Audi warranty or extended coverage to 100k miles—engine and transmission failures are financially catastrophic and not rare enough to ignore on a $25k+ used SUV.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Be the first to unlock repairs for the 2021 Audi SQ5
Procedures haven't been generated for this vehicle yet. Become the founding sponsor and we'll generate expert-grade, step-by-step repair walkthroughs for every common job on it — free for every mechanic and DIYer who looks it up after, forever.
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Audi A8, RS7, RS6 Avant, RS5 Sportback, RS5 Coupe, Q8, Q7, Q5 Sportback, S4 Sedan, Q5, A7, A6, A6 Allroad, A5 Sportback, A5 Coupe, A5 Cabrioleet, A4 Sedan, A4 Allroad, E-Tron Sportback Quattro, SQ7, S5 Cabriolet, E-Tron Quattro, SQ8, SQ5 Sportback, SQ5, S8, S7, S6 Sedan, S5 Sportback, S5 Coupe, 2022 E-Tron GT, and 2021-2022 RSQ8 vehicles. Due to a software issue, a blank or black screen may be displayed instead of the rearview camera image when the vehicle is placed in reverse gear. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
Consequence: A blank rearview camera display can reduce the driver's rear visibility, increasing the risk of a crash.
Remedy: Dealers will update the infotainment unit software, free of charge. Owner notification letters were mailed October 25, 2022. Owners may contact Audi's customer service at 1-800-253-2834. Volkswagen's number for this recall is 91DZ.
TIRES · 22V034000
2022-01-26
Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A5 Sportback, RS5 Coupe, RS5 Sportback, S5 Sportback, 2020-2021 A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A6 Allroad, A6 Sedan, A7, A8, Q5, S4 Sedan, S5 Coupe, S5 Cabriolet, S6 Sedan, S7, S8, SQ5, 2021 Q5 Sportback, Q7, Q8, RS6 Avant, RS7, RSQ8, SQ5 Sportback, SQ7, and SQ8 vehicles. The rear axle alignment may not have been inspected after the repairs for Recall 21V-295 (42L1) were performed.
Consequence: Rear axle misalignment may cause premature or uneven tire wear, increasing the risk of a crash.
Remedy: Dealers will inspect the rear axle, adjust the alignment as necessary, and replace any prematurely or unevenly worn tires, free of charge. Owner notification letters were mailed March 3, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L5.
ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM · 21V947000
2021-12-08
Volkswagen Group of America, Inc. (Audi) is recalling certain 2021-2022 Q5 Sportback, SQ5 Sportback, 2018-2022 Q5, and SQ5 vehicles. A liquid spill in the rear seat, or water ingress from an insufficient body seam underneath the vehicle may allow liquid to penetrate the gateway control module, causing it to shutdown.
Consequence: A gateway control module shutdown will suddenly reduce engine power, increasing the risk of a crash.
Remedy: Dealers will install a protective cover on the gateway control module and seal an underbody seam as necessary, free of charge. Owner notification letters were mailed January 21, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 90S9.
SEAT BELTS:REAR/OTHER:RETRACTOR · 21V606000
2021-08-05
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro, E-Tron Sportback Quattro, Q3, Q5, Q5 Sportback, Q7, Q8, RS5 Sportback, RS5 Coupe, RS6 Avant, RS7, RSQ8, S4 Sedan, S5 Cabriolet, S5 Coupe, S5 Sportback, S6 Sedan, S7, S8, SQ5, SQ5 Sportback, SQ7, SQ8, and 2021-2022 S3 Sedan vehicles. The rear seat belt automatic locking retractors may deactivate early, which can prevent the child restraint system from securing properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
Consequence: An unsecured child restraint system can increase the risk of injury during a crash.
Remedy: Dealers will inspect, and replace as necessary, the middle-rear seat belt assemblies, free of charge. Owner notification letters were mailed August 27, 2021. Owners may contact Volkswagen customer service at 1-800-893-5298 and Audi customer service at 1-800-253-2834. Volkswagen's numbers for this recall are 69CR (VW) and 69CS (Audi).
Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Q7, Q8, Q5 Sportback, SQ5 Sportback, RS6 Avant, RS7, RS Q8, 2020-2021 Audi S6 sedan, Q5, A8, S8, A7, A6 Allroad, A5 Cabriolet, A4 sedan, A4 Allroad, SQ5, S7, A6 sedan, S5 coupe, S4 sedan, S5 Cabriolet, A5 coupe, 2019-2021 RS5 coupe, A5 Sportback, S5 Sportback, RS5 Sportback vehicles. The lock nut on the trailing arm of the rear axle may break due to stress corrosion.
Consequence: A broken lock nut may misalign the rear axle, causing a loss of control and increasing the risk of a crash.
Remedy: Dealers will replace the lock nuts and, if necessary, the associated bolts, free of charge. Owner notification letters were mailed June 4, 2021. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L1.
Building an app?
Free API access to all this data — 50 requests/day, no card required.