How serious did it get for owners?

Among the 2,782 owner complaints naming this part, being towed is the outcome owners report most often.

Outcomes owners reported in complaints about this part

What it shows: Towed is the largest at 139, followed by Fire reported at 16; the smallest shown is Injury reported at 8.

Source: NHTSA owner complaint files · file downloaded 2026-10-05

Data and chart by CalcScrape: Spark Plug Replacement Cost Calculator