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How many ohms should a spark plug have?
I’m trying to do a little more DIY car repair, starting with reading my spark plugs. How many ohms should a spark plug have?
Natalie Todoroff · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
A
spark plug
should have between 500 and 3,000 ohms. If your plugs are a little on the older side, though, a value below 5,000 ohms is considered acceptable. The real trouble begins if it’s greater than 5,000 ohms: if your spark plugs are giving you a reading of more than 5,000 ohms, it’s time to get them replaced. Thankfully, the
cost of spark plug replacement
is pretty low; it usually costs just $120 to $140 for both parts and labor. Or, if you want to take a stab at doing it yourself, you’ll less than $5 for the new plugs. View full answer
- Gregory R.
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