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2021 Honda Civic Si
Buyable, but go in with open eyes: this car has specific known issues to check before money changes hands.
134 owner complaints · 4 recalls · data verified July 19, 2026 · source: NHTSA
Buy-rated alternatives from this era
Other 2019–2023 cars in the same rough price bracket with a clean, matured Buy verdict — worth cross-shopping before you commit to the 2021 Honda Civic Si.
Why caution?
4 recall campaigns (4 safety-critical). Confirm every one shows "remedy completed" on the seller's VIN.
Steering problems dominate (43% of complaints, typically reported near 40k miles).
Very few owner complaints for its age and sales volume.
Score breakdown, by factor
Full methodology →#288 of 402Among the 2021 models with a matured record, the 2021 Honda Civic Si ranks #288, scoring higher than 13% of them. See the 2021 ranking →
Complaints filed per year
Fading = early teething worked out. Climbing = problems aging in.
How it crashes
NHTSA’s own crash tests, separate from the reliability score above.
5/5 overall
NHTSA 5-Star Safety Rating · 2021 Honda CIVIC 4 DR FWD
Rollover risk in a single-vehicle crash: 10%
No open NHTSA defect investigations on file.
Source: nhtsa.gov/ratings. Star ratings compare vehicles within the same class and size, not across every car on the road.
The road ahead
What breaks on a 2021 Honda Civic Si, plotted where owners report it happening.
Also reported (mileage varies): Driver assistance (32) · Brakes (18) · Electrical system (17) · Lane Departure (11)
Mileage medians come from owners who mentioned an odometer reading in their NHTSA complaint, a rough guide, not a schedule.
Steering
43%57 complaints · typically near 40k mi · 41 in the last 2 years
“Steering rack binds and requires extra effort to return to center. Specifically for me, when proceeding on a long curve that requires me to turn my steering wheel left…”
Driver assistance
24%32 complaints · 8 in the last 2 years
“Steering wheel sticks once at highway speed, wheel turns but with a glitch”
Brakes
13%18 complaints · 6 in the last 2 years
“Cruise control does not disengage upon electronic parking brake being engaged while moving, causing the car to accelerate aggressively after the brake is released. Whi…”
Electrical system
13%17 complaints · 5 in the last 2 years
“The infotainment system in these vehicles is poor when using the navigation. Having the phone connected via wire will cause the phone and infotainment system to malfun…”
Check it against this car’s mileage
Type the odometer reading on the actual car you’re looking at to see which of these problem areas owners tend to report before it, around it, or after it.
We can place 1 of this model's commonly reported problem areas against a mileage. Nothing is stored.
Read all 134 owner complaints in their own words → · just the 6 crash/fire/injury reports →
Recalls (4)
Safety recall repairs are free at the brand’s franchised dealers. Before buying, run the VIN at nhtsa.gov/recalls and make the seller show the work was done.
Air Bags · 26V332000
Honda (American Honda Motor Co.) is recalling certain 2018-2021, 2023 Acura TLX, 2019-2024 RDX, 2017-2020, 2022-2026 MDX, 2017-2021, 2023, 2025 Honda Ridgeline, 2017-2022 Pilot, 2019-2021 Passport, 2018-2026 Odyssey, 2019-2022 Insight, 2019-2021 HR-V, 2018-2020 Fit, 2020-2022 CR-V Hybrid, 2017-2022 CR-V, 2017-2018, 2021 Civic Type R, 2017-2021 Civic hatchback, 2016-2020 Civic coupe, 2016-2022 Civic, 2017-2022 Accord Hybrid, and 2016-2022 Accord vehicles. The front passenger seat weight sensor may crack and short circuit, which can cause the air bags to deploy unintentionally during a crash.
Risk: Air bags that deploy unintentionally during a crash increase the risk of injury.
Fix: Dealers will replace the seat weight sensors, free of charge. Owner notification letters were mailed July 7, 2026. Owners may contact Honda's customer service at 1-888-234-2138. Honda's numbers for this recall are BOL, WO9, OOA, WOM, XOH, NOC, POD, BOE, UOF, POB, EOG, AOI, QO8, TOJ, DO7, and SOK. This recall expands previous NHTSA recall number 24V064. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning May 29, 2026.
Air Bags · 24V064000
Honda (American Honda Motor Co.) is recalling certain 2020-2022 Pilot, Accord, Civic sedan, HR-V, Odyssey, 2020 Civic coupe, Fit, 2021-2022 Civic hatchback, 2021 Civic Type R, Insight, 2020-2021 CR-V, CR-V Hybrid, Passport, Ridgeline, Accord Hybrid, 2020 Acura MDX, 2022 Acura MDX, 2020-2022 Acura RDX, and 2020-2021 Acura TLX vehicles. The front passenger seat weight sensor may crack and short circuit, failing to suppress the air bag as intended.
Risk: An air bag that deploys unintentionally during a crash can increase the risk of injury.
Fix: Dealers will replace the seat weight sensors, free of charge. Owner notification letters were mailed March 28, 2024, October 18, 2024, and August 2025. This is a phased recall. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for these recalls are XHP and VHQ.
Fuel System, Gasoline · 23V858000
Honda (American Honda Motor Co.) is recalling certain 2013-2023 Honda Accord, Civic Coupe, Civic Sedan, Civic Hatchback, Civic Type R, CR-V, HR-V, Ridgeline, Odyssey, Acura ILX, MDX, MDX Hybrid, RDX, RLX, TLX, 2019-2022 Honda Insight, Passport, 2020 Honda CR-V Hybrid, 2018-2019 Honda Clarity PHEV, Fit, and 2015-2020 Honda Accord Hybrid, Pilot, Acura NSX vehicles. The fuel pump inside the fuel tank may fail.
Risk: Fuel pump failure can cause an engine stall while driving, increasing the risk of a crash.
Fix: Dealers will replace the fuel pump module, free of charge. Owner letters were mailed September 6, 2024. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are KGC and KGD. This recall is an expansion of NHTSA recall numbers 21V-215 and 20V-314.
Service Brakes, Hydraulic · 23V458000
Honda (American Honda Motor Co.) is recalling certain 2020-2021 Civic, 2020-2023 Ridgeline, 2021-2023 Passport, 2021-2022 Pilot, and 2020 Acura MDX vehicles. The tie rod fastener that connects the brake booster and the brake master cylinder may have been improperly assembled during manufacturing, which can cause the brake master cylinder to separate from the booster assembly.
Risk: Brake master cylinder separation can cause a loss of brake function and increase the risk of a crash.
Fix: Dealers will inspect and repair the brake booster assembly as necessary, free of charge. Owner notification letters were mailed August 7, 2023. Owners may contact Honda customer service at 1-888-234-2138. Honda's numbers for this recall are VEU, AEV, and ZET.
Questions to ask the seller
Questions worth asking the seller of this Honda before you buy, drawn from its public record:
- NHTSA lists 4 recall campaigns for the 2021 Honda Civic Si. Can you run this car's VIN at nhtsa.gov/recalls and confirm each one shows "Remedy Completed"?
- Owners of this model report steering problems more than anything else (owners tend to report it near 40k miles). Has this car shown any steering symptoms, and are there repair records for it?
- Owners of this model report driver assistance problems more than anything else. Has this car shown any driver assistance symptoms, and are there repair records for it?
- Has this car been in any accident or had any structural, airbag, or flood-related repair? Do you have a clean title and a recent history report (Carfax / AutoCheck)?
- How many owners has it had, do you have the maintenance records, and why are you selling it?
- Are you open to me having an independent mechanic inspect it before we settle on a price?
Before you hand over money
Verify the recall work was done
NHTSA’s free lookup shows whether this exact car had its recall remedies completed.
Free NHTSA VIN check ↗Get a pre-purchase inspection
A $150 to $250 independent inspection of this exact 2021 Honda CIVIC SI beats every score on the internet, including ours.
What to ask forNot set on the 2021? See how every Civic Si model year scores →
Cross-shopping? Compare the 2021 Honda Civic Si against another car →
What owners say
Real owners of this exact model-year, shown separately from the NHTSA score. If they disagree, that’s worth knowing.