2018 Infiniti Q50 — check-engine light turned itself off — still scan it?

Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2018 Infiniti Q50 is losing coolant with no puddle. Save the big job until that test fails. On “check-engine light turned itself off — still,” that was the fork that mattered for me. That's the sequence I'd use. I'll poke at it this weekend.

This is usually cheaper to test than to guess. Loaded-suspension checks on the 2018 Infiniti Q50 catch play that a wheels-hanging inspection misses. If the cheap test changes it, stop and reassess. Write the result down so the next test isn't a repeat of the last one. Not interested in a five-hour wait for a shrug.

I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 2018 Infiniti Q50 is losing coolant with no puddle. If the cheap test changes it, stop and reassess. Any freeze-frame data saved? I'd sleep better after that step, even if it finds nothing. That's my plan before I call anyone.

I wouldn't throw parts yet. Two 2018 Infiniti Q50s can feel identical and have different causes, so measure before you copy someone else's repair. Don't erase codes until someone who can help has seen them. Do that first. I already checked the easy fluid levels.

Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2018 Infiniti Q50 and see if the fault moves. Save the big job until that test fails. A shop burned me once by skipping that step. Worth doing even if the car feels fine right now. Not interested in a five-hour wait for a shrug.

Log the conditions before you spend. Write temp, speed, and in-gear vs coast when the 2018 Infiniti Q50 does it — then decide on parts. Save the big job until that test fails. On “check-engine light turned itself off — still,” that was the fork that mattered for me. Learned this the expensive way on a previous car. If that fails I'll eat the diagnostic fee.

This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2018 Infiniti Q50 is losing coolant with no puddle. If the cheap test changes it, stop and reassess. Post the numbers (or the code) and people can get more specific. I'd rather look cautious in this thread than stuck later.

If it were in my driveway, capture voltage while the 2018 Infiniti Q50 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. This is from a 2018 Infiniti Q50 in Orange County with 72,000 miles. Just my two cents from doing this recently. If that fails I'll eat the diagnostic fee.

Start with the test that can prove you wrong. A pressure test beats staring at a dry driveway if the 2018 Infiniti Q50 is losing coolant with no puddle. Save the big job until that test fails. This is from a 2018 Infiniti Q50 in Orange County with 72,000 miles. I'd want that in writing, not as a promise. Your commute and mine probably aren't the same, but the test still applies. Checking again after work.

Ask what changed right before it started. Get a real battery/charging test on the 2018 Infiniti Q50, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. If you share a photo of the worksheet, easier to sanity-check. This is the version I'd tell a friend.

Intermittent stuff lies if you only catch it once. Two 2018 Infiniti Q50s can feel identical and have different causes, so measure before you copy someone else's repair. If the cheap test changes it, stop and reassess. On “check-engine light turned itself off — still,” that was the fork that mattered for me. This is from a 2018 Infiniti Q50 in Orange County with 72,000 miles. Have you gotten a second quote in writing? No warning lights, which is why I'm documenting it.

Intermittent stuff lies if you only catch it once. A pressure test beats staring at a dry driveway if the 2018 Infiniti Q50 is losing coolant with no puddle. Save the big job until that test fails. On “check-engine light turned itself off — still,” that was the fork that mattered for me. That's the sequence I'd use. Trying not to diagnose from the couch.

Ask what changed right before it started. Write temp, speed, and in-gear vs coast when the 2018 Infiniti Q50 does it — then decide on parts. If the cheap test changes it, stop and reassess. Was this after sitting overnight? I'm keeping receipts and dates in one folder.

I wouldn't throw parts yet. Write temp, speed, and in-gear vs coast when the 2018 Infiniti Q50 does it — then decide on parts. Save the big job until that test fails. Any freeze-frame data saved? Trying not to diagnose from the couch.

If it were in my driveway, write temp, speed, and in-gear vs coast when the 2018 Infiniti Q50 does it — then decide on parts. You'll know quickly if you're on the wrong tree. A shop burned me once by skipping that step. Not trying to scare you — just skip the expensive first guess. This is the version I'd tell a friend.

Intermittent stuff lies if you only catch it once. Write temp, speed, and in-gear vs coast when the 2018 Infiniti Q50 does it — then decide on parts. Don't erase codes until someone who can help has seen them. On “check-engine light turned itself off — still,” that was the fork that mattered for me. Write the result down so the next test isn't a repeat of the last one. This is the filter I use when the thread starts repeating itself. I'm in no rush to be a hero on it.

I'd want a measurement, not a hunch. A pressure test beats staring at a dry driveway if the 2018 Infiniti Q50 is losing coolant with no puddle. Save the big job until that test fails. Write the result down so the next test isn't a repeat of the last one. I keep a notes app thread for this now.

Ask what changed right before it started. Move a coil or plug on the 2018 Infiniti Q50 if it's cylinder-specific and see whether the code follows. Don't erase codes until someone who can help has seen them. This is from a 2018 Infiniti Q50 in Orange County with 72,000 miles. I'd want that in writing, not as a promise. This is me being the wet blanket on purpose.

I wouldn't throw parts yet. Capture voltage while the 2018 Infiniti Q50 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. I'd want that in writing, not as a promise. Your commute and mine probably aren't the same, but the test still applies. Only after sitting overnight so far.

This is usually cheaper to test than to guess. Move a coil or plug on the 2018 Infiniti Q50 if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. If they can't show the line item, I assume it's hiding. Checking again after work.

Update: the cheap test changed the symptom, so I'm not throwing parts yet. Happens in gear, not in park, for what that's worth.

Intermittent stuff lies if you only catch it once. Capture voltage while the 2018 Infiniti Q50 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. On “check-engine light turned itself off — still,” that was the fork that mattered for me. When does it actually happen? If the story changes I'll post the new data.