Which other parts do owners name in the same complaint?

Among the 13,993 owner complaints naming this part, spark plug is named in 5% of them, more than any other part.

Other parts named in the same complaints. Spark plug: 5%; Engine overhaul: 3%.

Owners name the spark plug most often in the same complaint, which is not proof that one caused the other. Ask the shop whether it checked the spark plug too, so you are not quoted twice for one visit.

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

Data and chart by CalcScrape: Check Engine Light Repair Cost Calculator