File · MAZDA-2-5T-SKYACTIV

2.5T Skyactiv carbon buildup / valve seal

Manufacturer

Mazda

Years

2018–2022

Where people complain about this

Reddit reply — long

That sounds like the **2.5T Skyactiv carbon buildup / valve seal** issue — it's a known defect on Mazda CX-5/CX-9/Mazda6 from 2018–2022.

Direct-injection 2.5L turbo engines suffer intake-valve carbon buildup leading to misfires and rough running, often within 60k miles.

Source: Mazda TSBs; complaints widespread.

If you've taken it to the dealer 2+ times for the same thing, you might have a lemon-law case. I built a free tool that checks your specific car against active class actions and NHTSA records — defectfiles.com. Takes about 60 seconds, no signup. Worst case it tells you nothing's there.

Reddit reply — short

Sounds like the 2.5T Skyactiv carbon buildup / valve seal issue — well-documented defect on Mazda 2018–2022, Mazda TSBs; complaints widespread. If your dealer's tried to fix it 2+ times you may have a case. Free 60-sec check at defectfiles.com.

Driving a Mazda CX-5? Run yours through the check.

Check my car →