2015 BMW 335i — temperature climbs in traffic but drops once moving

If it were in my driveway, move a coil or plug on the 2015 BMW 335i 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. I already checked the easy fluid levels.

Ask what changed right before it started. Move a coil or plug on the 2015 BMW 335i if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. If it doesn't change the out-the-door or the repair estimate, it's noise. Happens in gear, not in park, for what that's worth.

I wouldn't throw parts yet. Write temp, speed, and in-gear vs coast when the 2015 BMW 335i does it — then decide on parts. Don't erase codes until someone who can help has seen them. No need to make it theatrical. Worth doing even if the car feels fine right now. I'll update if anything new shows up.

Log the conditions before you spend. Loaded-suspension checks on the 2015 BMW 335i catch play that a wheels-hanging inspection misses. You'll know quickly if you're on the wrong tree. On “temperature climbs in traffic but drops once,” that was the fork that mattered for me. Verbal 'we'll take care of it' is not a plan. Climate here is different, so treat that as a local data point. That's my plan before I call anyone.