2016 Subaru WRX — dealer cannot reproduce an intermittent warning

Log the conditions before you spend. A pressure test beats staring at a dry driveway if the 2016 Subaru WRX is losing coolant with no puddle. That's the branch I'd chase this week. On “dealer cannot reproduce an intermittent warning,” that was the fork that mattered for me. I'd want that in writing, not as a promise. Cold start is when I can actually reproduce it.

Start with the test that can prove you wrong. Write temp, speed, and in-gear vs coast when the 2016 Subaru WRX does it — then decide on parts. You'll know quickly if you're on the wrong tree. Verbal 'we'll take care of it' is not a plan. If it repeats twice more I'll book time.

If it were in my driveway, a pressure test beats staring at a dry driveway if the 2016 Subaru WRX is losing coolant with no puddle. That's the branch I'd chase this week. 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.

Ask what changed right before it started. Capture voltage while the 2016 Subaru WRX is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. This is from a 2016 Subaru WRX in Orange County with 147,000 miles. If they can't show the line item, I assume it's hiding. Happens in gear, not in park, for what that's worth.