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2023 Subaru Outback — single-cylinder misfire comes and goes

ManualMechanicish811Community StarterMay 24, 20262023 Subaru Outback WildernessBrooklyn
2023 Subaru Outback Wilderness, about 45,000 miles. A cylinder-specific misfire code appeared after one rough start, then cleared and the engine feels normal. Plugs are not very old. Would you swap coils, inspect plugs, look at injector data, or wait for it to return?
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19 replies

RotorBuyer115Community StarterCommunity StarterMay 24, 2026permalink
I wouldn't throw parts yet. Swap the cheap/easy piece first on the 2023 Subaru Outback and see if the fault moves. Don't erase codes until someone who can help has seen them. Post the numbers (or the code) and people can get more specific. Your commute and mine probably aren't the same, but the test still applies. Not driving it hard until I know more.
RotorBuyer115Community StarterCommunity StarterMay 25, 2026permalink
I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 2023 Subaru Outback is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. This is from a 2023 Subaru Outback in Brooklyn with 45,000 miles. Post the numbers (or the code) and people can get more specific. I'd sleep better after that step, even if it finds nothing. I'll poke at it this weekend.
CommuterSeller940Community StarterCommunity StarterMay 25, 2026permalink
This is usually cheaper to test than to guess. Two 2023 Subaru Outbacks can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. No need to make it theatrical. If it repeats twice more I'll book time.
CommuterGeek873Community StarterCommunity StarterMay 25, 2026permalink
This is usually cheaper to test than to guess. Two 2023 Subaru Outbacks can feel identical and have different causes, so measure before you copy someone else's repair. Save the big job until that test fails. When does it actually happen? A day of patience here is cheaper than a wrong part. This is the version I'd tell a friend.
CamberDriver892Community StarterCommunity StarterMay 25, 2026permalink
Yes, with one caveat: If a shop can't duplicate it on the 2023 Subaru Outback, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. That's the whole play. This is the version I'd tell a friend.
CanyonEnthusiast939Community StarterCommunity StarterMay 25, 2026permalink
This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2023 Subaru Outback is losing coolant with no puddle. You'll know quickly if you're on the wrong tree. Write the result down so the next test isn't a repeat of the last one. No warning lights, which is why I'm documenting it.
RustBeltGuyCommunity StarterCommunity StarterMay 25, 2026permalink
Log the conditions before you spend. Move a coil or plug on the 2023 Subaru Outback if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. On “single-cylinder misfire comes and goes,” that was the fork that mattered for me. That's the whole play. Wrote this up on my lunch break.
RustBeltDaily757Community StarterCommunity StarterMay 25, 2026permalink
If it were in my driveway, if a shop can't duplicate it on the 2023 Subaru Outback, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. Verbal 'we'll take care of it' is not a plan. I'd rather be boring and correct. If it repeats twice more I'll book time.
BoxerBuilder54Community StarterCommunity StarterMay 25, 2026permalink
Log the conditions before you spend. Loaded-suspension checks on the 2023 Subaru Outback catch play that a wheels-hanging inspection misses. Save the big job until that test fails. On “single-cylinder misfire comes and goes,” that was the fork that mattered for me. Learned this the expensive way on a previous car. I'm in no rush to be a hero on it.
MarketDIYer623Community StarterCommunity StarterMay 26, 2026permalink
I hear you, though I'd still want a second check. Swap the cheap/easy piece first on the 2023 Subaru Outback and see if the fault moves. That's the branch I'd chase this week. Was this after sitting overnight? I'll poke at it this weekend.
ManualMechanicish811Community StarterCommunity StarterMay 25, 2026permalink
OP update: scanned the 2023 Subaru Outback again and still only have the one pending code, no new lights. Parking it somewhere I can hear it better next time.
NoMarkupTuner214Community StarterCommunity StarterMay 25, 2026permalink
Ask what changed right before it started. Get a real battery/charging test on the 2023 Subaru Outback, not just resting voltage, before blaming a module. You'll know quickly if you're on the wrong tree. Verbal 'we'll take care of it' is not a plan. Checking again after work.
NoMarkupTuner214Community StarterCommunity StarterMay 25, 2026permalink
Start with the test that can prove you wrong. Loaded-suspension checks on the 2023 Subaru Outback catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Verbal 'we'll take care of it' is not a plan. Trying not to diagnose from the couch.
ManualMechanicish811Community StarterCommunity StarterMay 25, 2026permalink
OP update: scanned the 2023 Subaru Outback again and still only have the one pending code, no new lights. Not interested in a five-hour wait for a shrug.
NewCarDetailer44Community StarterCommunity StarterMay 25, 2026permalink
If it were in my driveway, a pressure test beats staring at a dry driveway if the 2023 Subaru Outback is losing coolant with no puddle. That's the branch I'd chase this week. Stop there until you know. Heat soak after errands is the other window.
MarketDIYer623Community StarterCommunity StarterMay 25, 2026permalink
I wouldn't throw parts yet. Move a coil or plug on the 2023 Subaru Outback if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. Have you gotten a second quote in writing? Trying not to diagnose from the couch.
CommuterGeek873Community StarterCommunity StarterMay 26, 2026permalink
Ask what changed right before it started. Loaded-suspension checks on the 2023 Subaru Outback catch play that a wheels-hanging inspection misses. Save the big job until that test fails. Any freeze-frame data saved? Happens in gear, not in park, for what that's worth.
NoMarkupTuner214Community StarterCommunity StarterMay 26, 2026permalink
Ask what changed right before it started. Move a coil or plug on the 2023 Subaru Outback if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. Heat soak after errands is the other window.
NewCarDetailer44Community StarterCommunity StarterMay 26, 2026permalink
Intermittent stuff lies if you only catch it once. Capture voltage while the 2023 Subaru Outback is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. On “single-cylinder misfire comes and goes,” that was the fork that mattered for me. Do that first. Heat soak after errands is the other window.
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