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P0300
2017 Honda Civic
Honda
Severity
Medium
Safe to Drive
Yes
Est. Time
3hrs
Difficulty
Moderate
SYMPTOM
Intermittent misfire, worse when cold
Why This Happens
Carbon buildup on direct-injection intake valves is a known contributor to cold-start misfires on this engine.
VERIFIED FIX:
Intake valve carbon cleaning
How It Was Diagnosed
Carbon buildup on direct-injection intake valves is a known contributor to cold-start misfires on this engine.
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