How serious did it get for owners?

5% of the 2,782 complaints report a tow, the most common serious outcome; the other outcomes counted below are rarer, and an owner can file without mentioning one.

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 · downloaded 2026-10-05

Data and chart by CalcScrape: Spark Plug Replacement Cost Calculator