Example Check Engine Light Diagnosis Result
Vehicle context
Optional, but helpful for better resources, Garage history, and saved reports.
Best match from your answers
74%Code-guided emissions, ignition, or fuel control issue
A check engine light needs the stored code, but symptoms like rough idle and fuel economy changes help separate sensor, ignition, fuel, air, and evaporative emissions issues.
Parts: Varies by inspection findings and parts needed
DIY: Professional
Mechanic recommended
Why this matched
Based on the symptoms you selected
Why this matched
Based on the symptoms you selected
the warning involves the check engine light
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Other Possible Issues
Lower-confidence matches to keep in mind
Other Possible Issues
Lower-confidence matches to keep in mind
Ignition misfire or air/fuel control problem
Alternative possibility
66%
Ignition misfire or air/fuel control problem
Alternative possibility
Rough idle with a check engine light can come from misfire, air leaks, fuel delivery, or sensor feedback issues.
Next: Scan codes, review freeze-frame data, and inspect ignition and intake basics before replacing sensors.
DIY: Professional
Recommended Next Step
Limit Driving
Urgency: A flashing check engine light or severe misfire should be handled urgently because catalyst damage may occur.
Limit driving until the warning light is scanned and the stored codes are reviewed.
Symptom context
Since this comes and goes, intermittent wiring, sensor, heat-related, or connection issues may need to be checked.
Next step
Scan codes, record freeze-frame details if available, and compare symptoms with recent fuel, battery, or repair history.
NHTSA Findings
Unlock relevant NHTSA findings matched to this vehicle and the current diagnosis. NHTSA is the U.S. traffic safety agency behind recall and complaint data.
Official recall matches
Owner complaint patterns
Safety flags
Likely Parts, Tools, and Repair Paths
Preview likely repair paths, parts, tools, and confirmation notes before replacing anything.
Likely repair paths
Parts and tools
Diagnostic notes
DIY and Research Plan
Open guided video, forum, safety, and parts research based on the diagnosis and vehicle.
Guided search plan
Owner pattern checks
Parts and tools context
Repair Cost and Shop Quote Prep
See inspection expectations, quote ranges, questions, and red flags before calling a shop.
Inspection type
Repair range
Quote checklist
Mechanic Handoff
Generate a clean shop-ready summary with vehicle details, symptom history, and selected answers.
Shop summary
Symptom history
Selected symptoms
Save and Export
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Important
Wrenzo provides guidance based on selected symptoms and any vehicle details you entered. It is not a professional inspection, diagnosis, or repair decision. Use it to understand likely next steps, then verify safety-critical decisions with a qualified mechanic. If symptoms affect braking, steering, overheating, oil pressure, warning lights, or drivability, stop driving when safe and have the vehicle inspected.