- What the Twenty Domains Actually Are
- Exam Format and Where the Domains Show Up
- Cluster 1: Vehicle Fundamentals and Research
- Cluster 2: Electrical, Fuel Systems and Fuels
- Cluster 3: Documentation and Data
- Cluster 4: Fire Cause, Standards and Field Work
- Cluster 5: Electric Vehicles, Staged Fires and Liability
- Registration, Fees and Eligibility Mechanics
- Sequencing the Domains Across Your Preparation
- Domain Quick-Reference Table
- Keeping the Credential Current
- Frequently Asked Questions
- The twenty domains are NAFI course-curriculum topics, not an official exam blueprint, and no percentage weights were found.
- The written exam is 75 randomly selected multiple-choice/true-false questions, two hours, closed book, 75% minimum.
- NFPA 921, especially its Motor Vehicle Fires chapter, is the principal exam reference and anchors the course.
- Testing happens only alongside approved training; independent-proctor arrangements are not available for CVFI.
What the Twenty Domains Actually Are
If you are searching for the "official CVFI exam blueprint," here is the first thing to understand: NAFI (the National Association of Fire Investigators) does not publish one in the materials reviewed for this guide. What it does publish is the curriculum of its Vehicle Fire Investigation Training Program, the qualifying course that candidates attend before sitting the Certified Vehicle Fire Investigator (CVFI) exam. The twenty domains in this article reproduce that course's unweighted preparation curriculum, using NAFI's own wording, including phrases like "Electrical Vehicles" and "Case Evaluation of Stage Vehicles."
That distinction matters for how you study. The twenty headings are illustrative preparation topics. They are not a promise that each topic appears on the exam, and they are not an exhaustive list of everything the exam might touch. No official percentage weights were found, so any website claiming "Domain 7 is 12% of the exam" is inventing numbers. This guide will not do that. Instead, we treat the domains as a map of what an instructor-led, four-day vehicle fire course covers and what a working investigator is expected to know.
For a candidate-focused walkthrough of how to turn these topics into a plan, pair this article with the CVFI Study Guide 2026. This page is the topic-by-topic reference; the study guide is the how-to.
Exam Format and Where the Domains Show Up
The written exam is compact compared with the breadth of the curriculum. According to NAFI's certification materials, it consists of 75 randomly selected multiple-choice and true-false questions, with a two-hour time limit. It is closed book, outside references and assistance are prohibited, and a score of at least 75% is required. Results are recorded as pass/fail rather than as a numeric score on a transcript.
Two format details have direct consequences for how you read the domains:
- Random selection: Questions are drawn randomly, so you cannot predict which of the twenty topics will be emphasized on your particular sitting. Selective studying is risky. A weak area can show up more heavily than you expect.
- True/false inclusion: True/false items reward precision about definitions, standards, and the exact limits of what a method can prove. Vague familiarity is not enough.
The four-day, 28-hour national course is separate from the two-hour exam. Training is where the domains are taught; the exam is where retention and judgment are checked. If you want to understand the pass threshold in isolation, see CVFI Passing Score 2026, and for a realistic sense of difficulty, How Hard Is the CVFI Exam? No current overall pass rate was found in the reviewed issuer materials, so the CVFI Pass Rate discussion necessarily stays qualitative.
Cluster 1: Vehicle Fundamentals and Research
The first group of domains covers what an investigator must know before examining a burned vehicle: how it is supposed to work, where to find information about it, and how to gather background on a specific make, model and year.
Domain 1: Basic Vehicle Operation
You cannot reason about how a vehicle fire started without understanding how the vehicle normally operates. This domain establishes the baseline: how the major systems function together when a vehicle is running, parked, or being serviced.
- Normal operating state versus failure states of major systems
- How ignition, charging, starting and fueling relate to one another
- Why "what was running at the time" is a foundational fire-cause question
Domain 2: Vehicle Research
Before and during an examination, investigators research the specific vehicle: its build configuration, factory equipment, known issues and history. Expect questions about what to research and why it matters to hypothesis testing.
- Identifying the exact vehicle and its original equipment
- Separating factory configuration from aftermarket modification
- Using research to eliminate or support competing cause hypotheses
Domain 3: Information Sources
Knowing where reliable information lives is its own skill. This domain addresses the categories of sources an investigator draws on and how to weigh them.
- Manufacturer, regulatory and industry sources
- Witness, owner, repair and insurance information
- Evaluating source reliability before relying on it
These three domains are conceptually easy but easy to under-study. Candidates who come from structure-fire backgrounds often assume vehicle fundamentals are trivial and then lose points on terminology and system relationships.
Cluster 2: Electrical, Fuel Systems and Fuels
Vehicle fires cluster around ignition sources, fuels and the pathways between them. Four domains deal with exactly that.
Domain 4: Electrical Systems
Vehicle electrical systems are a frequent subject of cause-and-origin analysis. Candidates should understand how circuits are protected, how they fail, and how to distinguish a fire-caused electrical artifact from a fire-causing one.
- Battery, charging, starting and distribution fundamentals
- Circuit protection concepts and what their state can and cannot show
- Interpreting electrical damage without overreaching
Domain 7: Fuel Systems
This domain covers how fuel is stored, delivered and controlled, and where a breach or leak can create a fire scenario.
- Components from tank to delivery
- Pressurized versus non-pressurized elements and why it matters
- Where leaks and failures plausibly occur
Domain 8: Vehicle Fuels
Fuel properties drive fire behavior. Expect conceptual questions on how different fuels behave, ignite and spread.
- Properties of common vehicle fuels
- How fuel type affects ignition and burn behavior
- Why fuel identification supports or refutes a hypothesis
Domain 11: Post-crash Fuel Fed Fires
Collisions can compromise fuel systems and create ignition opportunities. This domain connects crash mechanics to fire outcomes.
- How impact can release fuel or create ignition sources
- Differentiating crash-initiated fires from pre-existing faults
- Evidence patterns that support a post-crash fuel-fed scenario
Cluster 3: Documentation and Data
A fire investigation that cannot be documented cannot be defended. Five domains address the recording and retrieval of information.
Domain 5: Scene Documentation
Recording the scene so that conditions can be understood and challenged later by other qualified people.
- Systematic photography, diagramming and notes
- Preserving context, not just the vehicle itself
Domain 6: Vehicle Documentation
The vehicle itself is evidence and must be recorded methodically, inside and out, before and during examination.
- Exterior, interior, engine compartment and underbody coverage
- Documenting damage patterns before disturbing them
Domain 9: Vehicle Accident Documentation
When a fire follows a collision, accident-scene information becomes part of the cause analysis.
- Capturing crash-related evidence and its relationship to the fire
- Coordinating with other responders and reports
Domain 10: Use of Computer Programs
Modern investigations rely on software for research, diagramming, data handling and reporting. Expect questions about the role and limits of these tools rather than software-specific button clicks.
- Appropriate uses of software in investigation and reporting
- Recognizing that tools support, but do not replace, analysis
Domain 14: "Black Box" Crash Data Retrieval
Many vehicles record event data. This domain addresses what such data is, why it matters and how it informs an investigation.
- What event data may reveal about pre-crash and crash conditions
- Preservation concerns and the risk of losing data
- Limits of recorded data and the need for corroboration
These documentation domains tend to be the most "procedural," which makes them well suited to true/false items about proper practice. If you learn the logic behind each practice (what it protects against), the right answer is usually deducible.
Cluster 4: Fire Cause, Standards and Field Work
Domain 12: FMVSS Standards
The Federal Motor Vehicle Safety Standards set requirements for vehicle safety performance, including fuel system integrity in certain crash conditions. Investigators should understand what these standards are and why they matter to fire analysis and later liability questions.
- The purpose and general scope of FMVSS
- How compliance relates to fuel-system and crash performance
Domain 13: SAE Standards
SAE standards are industry-developed engineering standards. This domain addresses their role as reference points for how vehicle systems are designed and tested.
- What SAE standards are and how they differ from regulatory standards
- Using standards as context, not as proof of cause
Domain 15: "Hands-On" Field Examinations
This is the practical heart of the curriculum: examining a burned vehicle systematically, reading burn patterns and testing hypotheses against physical evidence.
- Working from least to most damaged areas to find origin
- Reading and interpreting burn and damage patterns without confirmation bias
- Collecting and preserving evidence during the exam
Cluster 5: Electric Vehicles, Staged Fires and Liability
The final group covers the topics where vehicle fire investigation intersects with newer technology, fraud and litigation.
Domain 16: Electrical Vehicles
NAFI's curriculum lists this topic as "Electrical Vehicles," which in context addresses electric-powered vehicles and their fire-investigation considerations. Expect high-voltage systems and energy storage to be central.
- How electric drive and energy storage differ from conventional layouts
- Safety considerations unique to high-voltage systems
- Why traditional assumptions about fuel and ignition may not transfer
Domain 17: Staged Vehicles & Live Burns
Vehicle fires are sometimes set deliberately, often tied to fraud. This domain covers recognizing indicators of staging and understanding how live burns can illustrate fire behavior.
- Common indicators associated with staged vehicle fires
- What live-burn demonstrations can and cannot teach
Domain 18: Case Evaluation of Stage Vehicles
NAFI's wording is "Case Evaluation of Stage Vehicles." The emphasis is applying what you learned to evaluate a case, weighing indicators and avoiding unsupported conclusions.
- Structured evaluation of a suspected staged-vehicle case
- Balancing indicators against innocent explanations
Domain 19: Vehicle Recalls - Service Bulletins
Recalls and service bulletins can point to known defects relevant to a fire, but their existence alone does not establish cause.
- Distinguishing a recall from a service bulletin
- Using these records as leads that must still be tested against the physical evidence
Domain 20: Vehicle Products Liability
Vehicle fire investigations frequently feed into product-liability claims. This domain gives investigators the conceptual framework to understand how their work is used and scrutinized.
- Basic product-liability concepts relevant to fire investigation
- Why rigorous, well-documented methodology withstands scrutiny
Key Takeaway
Domains 16 through 20 reward restraint. A recall does not prove a defect caused your fire; staging indicators do not prove arson; an electric vehicle does not automatically mean a battery cause. Expect questions that punish jumping to conclusions.
Registration, Fees and Eligibility Mechanics
Because the exam is tied to approved training, logistics matter as much as content. The details below come from NAFI's program guidelines and the qualifying course listing.
Prerequisites
- Age 18 or older
- High-school diploma, GED or equivalent
- Good moral character and ethical conduct
- NAFI membership in good standing
- CFEI certification
- Board-accepted practical vehicle-fire investigation experience, usually 25 or more actual vehicle-fire investigations, subject to Board review
- An approved application and attendance at a qualifying course
Full detail on eligibility is in CVFI Requirements 2026.
Fees
The application fee is US$75 at a NAFI-sponsored program or US$135 at a preapproved training program, in addition to tuition. For NAFI's 2027 Vehicle Fire Investigation Training Program (September 13-16, 2027), the event listing shows US$850 tuition, a US$100 discount for NAFI members, and a separate US$75 CVFI examination fee. Meals and lodging are not included. For a full budget view, see CVFI Certification Cost 2026.
Applications and retakes
- Original, mailed applications are required: at least two weeks before a NAFI-sponsored course, or four weeks before another approved course.
- Testing occurs only with approved training. Independent-proctor arrangements are unavailable for CVFI.
- Retesting requires a written request and at least six months after a failure.
- Registrants may take CFEI and CVFI at the same 2027 training event, subject to eligibility.
| Item | What NAFI's materials state |
|---|---|
| Exam length | 75 randomly selected multiple-choice/true-false questions |
| Time limit | Two hours |
| Passing requirement | At least 75% |
| References | Closed book; outside references and assistance prohibited |
| Result reporting | Pass/fail |
| Retest wait | At least six months, with written request |
For scheduling realities, see CVFI Exam Dates 2026, and for course context, CVFI Training.
Sequencing the Domains Across Your Preparation
One short, CVFI-specific way to schedule your reading is to move from foundations to evidence to judgment. Below is a sample ordering tied to the domains themselves. Adjust the pacing to your experience and your course date.
Foundations
- Domains 1-3: vehicle operation, research, information sources
- Start reading the Motor Vehicle Fires chapter of NFPA 921
Systems and fuels
- Domains 4, 7, 8, 11: electrical, fuel systems, fuels, post-crash fires
- Draw the ignition-source / fuel / pathway chain from memory
Documentation and standards
- Domains 5, 6, 9, 10, 14: documentation, software, crash data
- Domains 12-13: FMVSS versus SAE distinctions
Judgment topics
- Domains 15-20: field exams, EVs, staging, recalls, liability
- Practice questions that test restraint and avoiding overreach
When you are ready to test retention, run timed sets on the CVFI practice test site and compare your results against the 75% threshold. Because the real exam is random, mix domains in your practice sets rather than drilling one topic at a time near the end.
Domain Quick-Reference Table
| Cluster | Domains | Core question |
|---|---|---|
| Fundamentals | 1, 2, 3 | How does this vehicle work, and where do I verify it? |
| Systems and fuels | 4, 7, 8, 11 | What could ignite what, and how did they meet? |
| Documentation and data | 5, 6, 9, 10, 14 | Can I record and preserve this so others can review it? |
| Standards and field work | 12, 13, 15 | What do the standards say, and what does the evidence show? |
| Newer tech, fraud, liability | 16, 17, 18, 19, 20 | Am I drawing only conclusions the evidence supports? |
If you want the same material in condensed form, the CVFI Cheat Sheet reduces these clusters to a one-page review. For the domain overview in its original framing, you can also revisit the CVFI exam domains guide.
Keeping the Credential Current
Passing the exam is not the end of the process. According to NAFI's FAQ and recertification pages, CVFI remains current through NAFI membership in good standing and CFEI recertification every five years. CFEI renewal requires 40 qualifying credits in that five-year period. Credits are not necessarily classroom hours, because qualifying NAFI training and instruction can earn enhanced credit. Recertification has no separate fee while membership dues remain payable.
That structure means the domains you study now have a long shelf life: you will keep using them, and the credential's value depends on maintaining your underlying CFEI standing. If you are weighing career payoff, see Is the CVFI Certification Worth It?, and for roles that use the credential, CVFI Jobs. Investigators commonly work in settings such as fire departments, insurance investigation, private consulting and litigation support, and the credential signals specialized vehicle-fire competence in those contexts. Because no reliable salary data was found in the reviewed issuer materials, treat any specific earnings claims with caution; the CVFI Salary Guide discusses the question qualitatively.
Frequently Asked Questions
No. They reproduce the preparation curriculum of NAFI's qualifying Vehicle Fire Investigation Training Program. They are illustrative topics, not a published exam blueprint, and no official percentage weights were found. Study all twenty rather than guessing at emphasis.
The written exam has 75 randomly selected multiple-choice and true/false questions, a two-hour limit, and a closed-book format. You need at least 75% to pass, and results are recorded as pass/fail.
No. Testing occurs only with approved training, and independent-proctor arrangements are unavailable for CVFI. You must also hold CFEI certification, be a NAFI member in good standing, and have Board-accepted vehicle-fire experience.
NFPA 921 is the principal exam reference, and the qualifying course is based on its Motor Vehicle Fires chapter. The paid text and course handouts were not retrieved for this guide, so confirm current materials with NAFI directly.
Retesting requires a written request and at least six months after the failure. Use that time to revisit the weakest domain clusters and practice with mixed-topic question sets before you reapply.