EngineHigh
1.5T oil dilution — fuel mixes into the oil, most common in cold climates and short trips.
- Typically appears
- Any
- What to inspect
- Pull the dipstick and smell for fuel; check for a gas-like odor and over-full oil level.
2016–2021 Honda Civic · common problems & known faults
The tenth-generation Civic drives well and holds value, but the turbocharged 1.5L engine has a specific fuel-in-oil issue and a few early-build faults to verify.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed July 2026
Quick answer
The most commonly reported faults on the 2016–2021 Honda Civic are 1.5T oil dilution — fuel mixes into the oil, most common in cold climates and short trips, Cracked block on some early 2016 1.5T engines (subject to warranty extension) and AC condenser failure / refrigerant leaks. 2 of the documented issues are rated high severity · inspect these first. Full inspection points, onset mileage and what to check are listed below.
Reliability snapshot
Based on the documented faults on this page for the Honda Civic.
7.0/ 10
- Critical
- 0
- High
- 2
- Medium
- 1
- Low
- 1
Guidance only · reflects reported patterns, not a specific car's condition.
Known faults to check
EngineHigh
Cracked block on some early 2016 1.5T engines (subject to warranty extension).
- Typically appears
- Early miles
- What to inspect
- Check for coolant loss and confirm any block replacement in service history.
HVACMedium
AC condenser failure / refrigerant leaks.
- Typically appears
- 40,000+ miles
- What to inspect
- Confirm cold AC and ask about any condenser replacement.
ElectricalLow
Infotainment lag and software bugs (improved by updates).
- Typically appears
- Any
- What to inspect
- Test the touchscreen and confirm software is up to date.
Inspecting a Honda Civic?
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Check this exact carFrequently asked questions
Is the 1.5 turbo Civic reliable?
Generally yes, but the oil-dilution issue is real — frequent oil changes and highway use reduce it. Inspect the oil before buying.
Should I avoid the 2016 Civic?
Early 2016 1.5T cars had a block-cracking issue covered by a warranty extension; verify it was addressed.
Is the 2.0L Civic better?
The naturally aspirated 2.0L avoids the oil-dilution concern and is very robust, though less powerful.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.