Research a used car's safety history

Why Safety Research Matters More for Used Cars

When you buy a new car from a dealership, the manufacturer's warranty covers defects and the vehicle has zero history of real-world problems. A used car is different. It has been driven for years, possibly through multiple owners, and may carry unresolved recalls, known defect patterns, or component wear that the seller is not required to disclose.

The used car market in the United States moves roughly 40 million vehicles per year. Many of those sales happen between private parties, where there is no obligation to disclose safety history beyond what state law requires. Even at dealerships, disclosure requirements vary by state and often do not cover NHTSA complaint patterns or closed investigations.

The good news is that nearly all the safety data you need is publicly available and free. NHTSA maintains comprehensive databases of complaints, recalls, crash test ratings, and defect investigations going back decades. The challenge is knowing how to find it, read it, and interpret it, which is what this guide covers.

Step 1: Check for Open Recalls by VIN

This is the single most important step and takes less than a minute. Go to NHTSA's recall lookup and enter the vehicle's 17-digit VIN (found on the dashboard, driver's side door jamb, or title). The tool will show every recall campaign affecting that specific vehicle and whether each recall has been completed.

An open recall means the manufacturer has identified a safety defect and issued a remedy, but that specific vehicle has not been repaired yet. Under federal law, recall repairs must be performed at no cost to the owner, regardless of the vehicle's age or mileage. If the car you are considering has an open recall, the repair should be completed before or immediately after purchase.

Pay close attention to the severity of any open recalls. A recall for a minor label correction is very different from one involving a faulty airbag inflator or a fuel system fire risk. Read the defect description and consequence section carefully.

Step 2: Review Complaint Patterns for the Model Year

After checking recalls, search for NHTSA complaints on the specific make, model, and year. You can do this on PlainCars or at safercar.gov. You are looking for patterns, not individual complaints.

Focus on component categories. NHTSA groups complaints by vehicle component: engine, transmission, brakes, electrical system, steering, airbags, fuel system, and dozens more. A cluster of complaints about a specific component, say, 80 complaints about engine stalling in a model year that sold 150,000 units, is a meaningful signal. Browse component complaint data on our components page.

Look for crash and injury flags. Every NHTSA complaint records whether the issue caused a crash, fire, injury, or death. Complaints flagged with these outcomes carry more weight than inconvenience reports. If a model year has multiple crash-related complaints about the same component, treat that as a serious warning.

Read the narratives. Click into individual complaints and read the consumer descriptions. Patterns become clear quickly: if 30 different owners describe the same failure mode (e.g., "transmission jerks violently between 2nd and 3rd gear at 45,000 miles"), that is a systemic issue, not random bad luck.

Compare across model years. Some vehicles have excellent complaint records in most model years but a problematic outlier, often the first year of a redesign. Checking the year before and after your target can reveal whether the issue was isolated or persistent.

Step 3: Check for NHTSA Investigations

NHTSA opens formal defect investigations when complaint patterns suggest a safety issue may be systemic. An investigation does not guarantee a recall will follow, but it means NHTSA analysts reviewed the complaint data and found enough evidence to warrant engineering review.

Check the investigations page or NHTSA's investigations database for any open or closed investigations on your target vehicle. A closed investigation with no recall usually means NHTSA did not find sufficient evidence of a defect, but the underlying complaints still exist and are worth reviewing.

An open investigation is a stronger signal. It means NHTSA is actively reviewing whether a safety defect exists. Buying a vehicle under active investigation is not necessarily a deal-breaker, but you should understand the issue being investigated and factor it into your decision.

Step 4: Review Crash Test Ratings

NHTSA's New Car Assessment Program (NCAP) rates vehicles on a 1-to-5 star scale for frontal crash, side crash, and rollover resistance. A 5-star overall rating means the vehicle performed well in all categories. These ratings reflect the vehicle's structural design, not its reliability or defect history.

Crash test ratings are most useful for comparing vehicles within the same class and size. A 5-star subcompact does not offer the same absolute crash protection as a 5-star midsize SUV - the stars reflect performance relative to the vehicle's own weight class.

For used cars older than 10–12 years, crash test ratings may not be available, and safety standards have improved significantly. A vehicle that earned 5 stars in 2012 may not meet the same structural standards as a 4-star vehicle from 2024.

Step 5: Cross-Reference with Other Sources

NHTSA data is the most authoritative free source, but it is not the only signal worth checking. For a complete picture, consider supplementing with:

• Vehicle history reports. Services like Carfax and AutoCheck compile title records, accident reports, odometer readings, and service history. They cost money but can reveal accidents, flood damage, or title issues that NHTSA data does not cover.
• Owner forums. Model-specific forums (e.g., forums for Honda Civic, Toyota 4Runner, Ford F-150) contain detailed owner experiences. Search for the specific model year and component you are concerned about. Forum discussions often provide more mechanical detail than NHTSA complaint narratives.
• Manufacturer technical service bulletins (TSBs). TSBs are instructions from the manufacturer to dealerships about known issues and repair procedures. They are not recalls, the manufacturer is not required to notify owners, but they indicate acknowledged problems. NHTSA publishes TSBs alongside complaint data.
• Pre-purchase inspection. No amount of data research replaces a physical inspection by an independent mechanic. Budget $100–$200 for a pre-purchase inspection before committing to any used vehicle, especially one with a significant complaint history.

What to Do If You Find Problems

Finding complaints or recalls on a vehicle does not mean you should walk away. Here is how to evaluate what you find:

Open recalls: must be fixed. If the vehicle has an open recall, the repair should be completed at an authorized dealership before purchase (or immediately after). This is free and non-negotiable for safety.

High complaint volume on safety-critical components: proceed with caution. If the model year has a disproportionate number of complaints about brakes, steering, airbags, or the fuel system, especially with crash or injury flags, this is a reason to either walk away or negotiate a significantly lower price and plan for the repair.

Complaints about comfort or convenience issues: less concerning. Complaints about interior noise, infotainment glitches, or paint quality affect livability but not safety. These are annoyances, not deal-breakers.

A closed investigation with no recall: monitor but don't panic. NHTSA reviewed the evidence and decided a recall was not warranted. The issue may still exist at low rates. Read the investigation closing summary to understand what was found.

The goal is not to find a vehicle with zero complaints, that vehicle does not exist. The goal is to understand what problems exist, how serious they are, and whether they are acceptable given the vehicle's price, age, and your intended use.

Frequently Asked Questions

How do I check if a used car has safety complaints?

Search the NHTSA complaints database at safercar.gov or use PlainCars to look up complaints by make, model, and year. Pay attention to the total complaint count, which components are most affected, and whether any complaints involved crashes, fires, or injuries.

What is the most important safety data to check before buying a used car?

Check three things: (1) Open recalls using the VIN lookup at safercar.gov. (2) Complaint patterns by searching the make, model, and year for clusters of safety-critical component failures. (3) NHTSA investigations to see if the government has formally reviewed any defect patterns on that vehicle.

Are NHTSA complaints reliable for evaluating used cars?

NHTSA complaints are a useful signal but not a definitive verdict. They are self-reported and not individually verified. High complaint volumes about specific components in specific model years are meaningful, especially when multiple owners describe similar failure modes. Supplement with recall history, crash test ratings, and a pre-purchase inspection.

How do I check if a used car has been recalled?

Enter the vehicle's 17-digit VIN at NHTSA's recall lookup tool (safercar.gov/recalls) to see all recalls affecting that specific vehicle and whether each has been completed. Recall repairs are always free, regardless of the vehicle's age.

Should I avoid buying a car with a lot of NHTSA complaints?

Not necessarily. A high total complaint count may reflect high sales volume. What matters more is whether complaints are concentrated in safety-critical systems and whether they describe similar failure modes. A vehicle with many complaints about interior trim is very different from one with many complaints about sudden engine stalls.