Code4010030
Operation Code: 4010030
Standard Labor Map: Spark Plug Replacement
About This Operation Code
When you see 4010030 on your mechanic's quote or invoice, it refers to the standardized automotive industry code for Spark Plug Replacement. Mechanical shops use these codes to lookup predefined labor times (guided by Alldata or Mitchell 1).
Spark plugs ignite the fuel-air mixture in your engine's cylinders. Worn plugs can cause rough running or poor fuel economy.
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Standardized Labor
Shop labor rates range from $120–$250/hour depending on your city. Using 4010030 prevents a mechanic from charging "made up" times.
Average Total Cost (Labor + Parts)
~$100-$250 (for all plugs, parts & labor; cost depends on number of cylinders and plug type)
*Based on 2026 national averages for spark plug replacement.
View Full Pricing Guide →⚠️ Beware Overlap Labor
Dishonest shops often double-dip labor when billing multiple Op Codes. For example, if parts must be removed to access Spark Plug Replacement, they shouldn't bill full Book Time for both codes.
Recommending plug replacement too frequently (modern iridium plugs last 60k+ miles, but some shops push changes at 30k or less); upselling premium “performance” spark plugs that cost more but offer no benefit in a normal engine; not quoting the additional cost of replacing spark plug wires or coil boots if needed (possibly added later as surprise).
Scan Quote for Overlap →