How often do you change plugs in 2000 Toyota Echo?

Answer 1

Depends on the plugs. This model year came with Iridium plugs that are capable of lasting more than 100,000 miles. I used mine for 120,000 miles. If you replaced them, you should go by the recommendation of the manufacturer of the new plugs. Some are only good for 20,000 miles, the average might be 30,000-40,000 miles. If you notice a drop off in fuel economy or any type of engine performance problem or sometimes a check engine light related to the plugs, then you probably waited too long to replace them.