Which engine sizes show up most in complaints about this part?

Among 2,750 owner complaints about this part where the VIN identifies the vehicle, 26% involve engines of under 1.6 L, against 11% of complaints about all the parts we track.

Engine size of the vehicles in complaints about this part, against all tracked parts

What it shows: 1.6 to 2.0 L is the largest at 37%, followed by under 1.6 L at 26%; the smallest shown is over 5.0 L at 4%.

Source: NHTSA owner complaint files with VINs decoded by NHTSA vPIC · data from 2025

Data and chart by CalcScrape: Spark Plug Replacement Cost Calculator