The average cost for a Spark Plug Replacement is between $130 and $179. Labor costs are estimated between $70 and $89 while parts are priced between $60 and $90. Get a personalized estimate based on your location and specific car. Estimate does not include taxes and fees.
Spark Plug Replacement Cost for Hummer H3
Spark Plug Replacement Estimate (National Average)
To prevent ignition misfires and Check Engine Light problems, we recommend using only high-quality spark plugs, and preferably spark plugs from Hummer.
Spark plugs have different ratings and it's important that the correct type are used.
Spark plug terminals wear down over time and can lead to engine misfires. At minimum, they need to be replaced at the mileage specified by Hummer.
Failing spark plugs can cause the Hummer H3's engine to run rough and misfire, which can trigger the Check Engine Light. Continuing to drive under these conditions can damage the catalytic converter.