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Symptom selected
Check engine light came on this morning
Diagnosis
Analyzing symptoms...
Most Likely Cause
Likely: O2 sensor or loose gas cap
The P0420 pattern matches a degraded oxygen sensor or catalyst efficiency drop.
Diagnosis complete — you know what to inspect next
Most Likely Cause
Likely: O2 sensor or loose gas cap
The P0420 pattern matches a degraded oxygen sensor or catalyst efficiency drop.
For Car Owners
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Tell us what's happening with your car. FixMyRide helps you understand the likely causes, check what to look for, and figure out what to do next.
Diagnose
Find the likely cause
Describe the symptoms and get the most likely causes for your vehicle — in plain language.
Diagnose
Find the likely cause
Describe the symptoms and get the most likely causes for your vehicle — in plain language.
Inspect
Know what to check
Follow practical inspection steps to help confirm what's actually wrong before visiting a shop.
Inspect
Know what to check
Follow practical inspection steps to help confirm what's actually wrong before visiting a shop.
Repair
Know what to do next
Use repair guidance to understand your next steps once the cause is identified.
Repair
Know what to do next
Use repair guidance to understand your next steps once the cause is identified.
Understand what's happening with your car.
Don't stop at a diagnosis. Know what to check next — and what to do about it.
Diagnostics
Your warning light is on.
Should you panic?
Describe your symptoms and get the most likely causes, a severity level, and practical next steps — in plain language, before you ever visit a shop.
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Reported Symptom
Car shakes when braking from highway speed
Warped brake rotors (most likely)
High-speed vibration during braking is a classic rotor warping pattern, especially after heavy use.
Next steps
Inspect rotors for visible grooves or heat discoloration
Check brake pad thickness at each wheel
2021 Honda Civic
1.5T · Sedan · 42,000 mi
Diagnostics
3 run
Issues
1 resolved
Last checked
Nov 2024
Insights
2 available
Recent diagnostic
Warped brake rotors — resolved
Specifications
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Start diagnosing your car today — no payment ever required.
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- 5 vehicles in Garage
- 25 diagnostics
- 5 vehicle searches
- Standard analysis
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