2015 Honda Odyssey: Spark plug misfires due to O-ring failure
Common wear/failure (not a recall)
Symptoms
Owners of the 2015 Odyssey report: spark plug misfires due to o-ring failure. CarComplaints.com lists 3 owner complaints, average mileage 122,500 miles.
NHTSA has 53 owner complaints for the 2015 Odyssey in this area. Examples:
- NHTSA complaint ODI #11753638 (filed 07/29/2026): “I first experienced an engine misfire in february 2025. the vehicle had a p0301 misfire code, and at the time i was unaware of honda’s extended warranty related to this issue. we had a trusted mechanic friend inspect the vehicle and replace the spark plugs and…”
- NHTSA complaint ODI #11753339 (filed 07/28/2026): “American honda motor co., inc. issued an official warranty extension in july 2025 covering engine misfires from piston ring deterioration (dtcs p0301-p0304) on 2013-15 pilot and 2013-17 odyssey vehicles. my 2015 honda odyssey (vin: [xxx]) experienced this ex…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: total replacement of pistons, o rings, timing belt (2 reports) replace piston rings (1 reports). Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Pro
Internal engine work (lifters, oil consumption, fuel dilution diagnosis) requires engine teardown or dealer software/tests. (Our assessment.)
Cost
CarComplaints.com owners report a typical repair cost of about $3,680 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
- CarComplaints.com: Spark plug misfires due to O-ring failure (2015 Odyssey)
- NHTSA complaints API, 2015 Odyssey
Page last updated .