Find what’s wrong with your car in minutesLikely causes, risk level, and what to check first—without guess-based repairs.
Enter symptoms, error codes, and car details to see likely causes, risk level, and what to check first.
The same warning can mean different things on different engines; context beats a one-line internet answer.
Start the guided flow in one click, or search below.
Start diagnosisQuick search
Type a symptom, fault code, or part. Use ↓ ↑ to move, Enter to select.
Example searches: car jerks when accelerating·engine overheating at idle·black smoke from exhaust·P0299 turbo underboost
Not a workshop diagnosis; seek professional help for safety-critical issues.
Why this approach?
Not random advice—consistent, repeatable output for the same inputs.
Grounded in structured data
Reads symptom, vehicle, and conditions together; ranks what matters first.
Not only “why”—also what to do next
Pairs risk and drivability notes with practical first checks.
Shows checks before the workshop
Actionable order of checks that helps reduce guesswork and repeat repairs.
How it works
A short product flow that reads symptoms and codes in context—same result layout every time.
Describe the symptom or code
Use plain language, enter a DTC, or pick your vehicle in the flow.
Clarify context
Refine with a few questions
Clarify misfires, loss of power, smoke, and similar signals in short steps.
See ranked causes and first checks
Ordered causes, risk, drivability notes, and actionable checks.
What you get
The sections on the result screen help you decide before parts or a workshop visit.
Ranked likely causes
Candidates in priority order so you know what to rule out first.
Risk and urgency
A clear band for severity and how quickly you should act.
Is the car safe to drive?
Continue, limited use, or stop—safety stays first.
First-check checklist
A sensible sequence you can try at home or roadside before major work.
Rough cost band
Low–mid–high range for expectations—not a quote, but a decision frame.
Workshop briefing snippet
Short text you can hand to a technician to reduce back-and-forth.
Sample diagnosis output
Preview the structure and tone of the result screen before you run the live flow.
Input
Symptom
Loss of power
Extra signal
Black smoke
Turbo, EGR, and DPF can look similar; extra signals help separate them.
Sample result summary
Probability estimate—not a definitive diagnosisLikely causes
Turbo boost leak — high likelihood
Often appears with power loss and black smoke.
EGR restriction — medium
Worse at low rpm and partial load is typical.
DPF loading / regen need — medium
City driving can combine pressure and smoke.
Risk level
Medium
Measurement and visual checks are recommended.
Drivability
Limited
Avoid heavy loads and aggressive throttle.
Popular entry points
Fast paths people use most often
Common symptoms
Pages that match everyday complaints.
Common fault codes
Pick a code; see typical causes on one screen.
Parts lens
What you might feel when a part fails—symptom and risk at a glance.
Sample vehicle profiles
Sharper starting points by make and model.
How do you interpret a car problem?
One symptom can stem from different parts or systems—for example, power loss can involve turbo, fuel, or intake. Do not read the symptom in isolation; whenever possible, read it together with vehicle and usage context.
Wrong or early diagnosis drives unnecessary parts spend. A DTC can point the right direction, yet what the code measures and the engine’s real condition can differ—expecting certainty without context is risky.
ArizaLab ties symptom, code, and vehicle context into one flow; ranks causes and highlights risk and first checks. In critical cases, choose the safe side; when measurement or expert review is needed, involve a professional.
Understand your issue now
In about two minutes: likely causes, risk level, and a sensible first-check order.