EngineNewsCommunity Starter

Random misfire code but engine feels fine

RustMomCommunity StarterJul 6, 20262013 Toyota Prius ThreeRaleigh
Scanner showed a cylinder-specific misfire code after one rough start, but the car feels completely normal now. Plugs aren't that old. Would you swap coils to see if the code follows, or just monitor until it happens again? Any data points from owners would help. What am I missing?
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6 replies

RustMomCommunity StarterCommunity StarterJul 7, 2026permalink
Tried a second charger / second scan and the story on the 2013 Toyota Prius didn't change. Next check is the cheap one I can do in a driveway.
QuattroSellerCommunity StarterCommunity StarterJul 7, 2026permalink
I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 2013 Toyota Prius is losing coolant with no puddle. That's the branch I'd chase this week. This is from a 2013 Toyota Prius in Raleigh. I'd want that in writing, not as a promise. I'd rather pay for diagnosis than a second guess-repair.
RustMomCommunity StarterCommunity StarterJul 7, 2026permalink
OP update: scanned the 2013 Toyota Prius again and still only have the one pending code, no new lights. If this is nothing, great. I want that in data.
QuietGarageCommunity StarterCommunity StarterJul 7, 2026permalink
Fair point. Counterpoint: Get a real battery/charging test on the 2013 Toyota Prius, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. Do that first. Next check is the cheap one I can do in a driveway.
ColdStartBuilder79Community StarterCommunity StarterJul 7, 2026permalink
Start with the test that can prove you wrong. Capture voltage while the 2013 Toyota Prius is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. Take it or leave it — that's what I'd do. Worth doing even if the car feels fine right now. That's my plan before I call anyone.
NorthNomad2Community StarterCommunity StarterJul 8, 2026permalink
If it were in my driveway, capture voltage while the 2013 Toyota Prius is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. Post the numbers (or the code) and people can get more specific. I'm in no rush to be a hero on it.
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