2021 Nissan Sentra: Problems & Reliability
CAUTION2021 Nissan Sentra: CAUTION — 133 owner complaints (1.04 per 1,000 sold), rated on its 3 recall campaigns; top issue: forward collision avoidance (40 complaints).
CarWhere's verdict score for the 2021 is 1.25, where 1.00 is a typical Sentra year once complaints are weighted for severity and spread over time on the road; caution starts at 1.25 and avoid at 1.60. 53% of its complaints are severe — a crash, fire, injury or a safety-critical system. Its raw count is below the median year, but it has been on the road only about 5 years, so complaints are arriving faster than for older Sentra years.
Sources: NHTSA owner complaints (ODI), recall campaigns and manufacturer service bulletins, published U.S. sales, CarWhere verified buyer prices · Model years 2015–2026 compared · Updated 2026-11-07 · By CarWhere Research · Methodology
133
NHTSA complaints
1.04
Complaints per 1,000 sold
132
Service bulletins
3
Recall campaigns
Most-reported 2021 Nissan Sentra problems
Forward collision avoidance is the clear leader, named in 30% of complaints.
| Component | Complaints | Share of 2021 complaints |
|---|---|---|
| Forward collision avoidance | 40 | 30% |
| Steering | 40 | 30% |
| Electrical system | 38 | 29% |
| Service brakes | 24 | 18% |
| Unknown or other | 19 | 14% |
A complaint can name more than one component, so shares can add up to more than 100%.
2021 Nissan Sentra recalls
3 recall campaigns on federal record for the 2021, reported between Jun 17, 2021 and Sep 8, 2023.
2021 Nissan Sentra service bulletins
The manufacturer has filed 132 technical service bulletins with NHTSA for the 2021 — close to the 120 of the median Sentra year from 2015 to 2026. Coded bulletins most often cover electrical system (91), forward collision avoidance (13), engine & cooling (12). Bulletins are repair instructions for dealer technicians, not recalls.
The 2021 vs. the year before and after
From the 2020 to the 2021, owner complaints fell 36% (208 → 133) — an improvement. The 2022 that followed fell 39% (133 → 81), so the 2022 has the lighter record so far.
| Model year | Verdict | Complaints | Bulletins | Recalls | Avg. buyer-paid |
|---|---|---|---|---|---|
| 2020 Sentra | CAUTION | 208 | 115 | 4 | — |
| 2021 (this page) | CAUTION | 133 | 132 | 3 | — |
| 2022 Sentra | SOLID | 81 | 98 | 2 | — |
Prices are averages of CarWhere verified buyer transactions (shown when 3+ deals exist for the year). Full year-by-year table: Nissan Sentra years to avoid.
What to check on a used 2021 Nissan Sentra
Forward collision avoidance (40 complaints on the 2021): ask about false automatic-braking events and look for driver-assist warning messages.
Steering (40 complaints on the 2021): check for a steering warning light, heavy or notchy steering at parking speed, and clunks over bumps.
Electrical system (38 complaints on the 2021): test every light, window, lock, the infotainment screen and the charging system, and have the car scanned for stored fault codes.
Service brakes (24 complaints on the 2021): check pedal feel, pulling and grinding, look at rotor and pad wear, and ask when the brake fluid was last changed.
Engine (7 complaints on the 2021): cold-start it yourself and listen for ticking or knocking; check for oil leaks, low coolant and a lit check-engine light, and ask for oil-change records.
Recalls: confirm all 3 campaigns above were completed on this VIN.
Know what to pay for the right 2021 Nissan Sentra — then negotiate it
Years-to-avoid tells you which year. Search live listings to see the target price and what verified buyers actually paid for it.
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FAQ
Is the 2021 Nissan Sentra reliable?
2021 Nissan Sentra: CAUTION — 133 owner complaints (1.04 per 1,000 sold), rated on its 3 recall campaigns; top issue: forward collision avoidance (40 complaints). CarWhere's verdict score for the 2021 is 1.25, where 1.00 is a typical Sentra year once complaints are weighted for severity and spread over time on the road; caution starts at 1.25 and avoid at 1.60.
What are the most common 2021 Nissan Sentra problems?
By NHTSA owner complaints, the most-reported areas on the 2021 Nissan Sentra are forward collision avoidance (40, 30%), steering (40, 30%), electrical system (38, 29%). The manufacturer has 132 service bulletins on file for this model year.
How many recalls does the 2021 Nissan Sentra have?
3 recall campaigns on federal record for the 2021 Nissan Sentra, most recently 23V628000 (Sep 8, 2023, backup camera / back-over prevention); 23V581000 (Aug 15, 2023, steering); 21V461000 (Jun 17, 2021, steering). Recall completion is VIN-specific, so check the exact car.
How do I check a specific 2021 Nissan Sentra before buying?
Decode the VIN free at carwhere.com/tools/vin-decoder to confirm the build, then run the $9.99 CarWhere Full VIN Report for the exact VIN — recall, complaint, and service-bulletin record for this model year, the original window sticker where the manufacturer publishes one, and a market price check from verified buyers. One-time purchase, no subscription.
Sources & method
Complaint, recall and service-bulletin counts for the 2021 Nissan Sentra come from NHTSA's Office of Defects Investigation; the per-1,000 rate divides complaints by published U.S. 2021 calendar-year sales; the verdict is CarWhere’s severity-weighted, time-on-road-adjusted score compared with the model’s own median year. Complaints are owner allegations, not verified defects. Full methodology.