Spark Plugs Guide & Diagnostic Information
Spark plugs ignite the compressed fuel-air mixture in the engine combustion chambers.
Location on Vehicle
Screwed into the top of the cylinder heads inside the combustion chambers.
Typical Symptoms of Failure
- Misfiring when cold
- Engine shaking at idle
- Decreased gas mileage
Associated Diagnostic Trouble Codes
A malfunction in the Spark Plugs can trigger the following OBD-II fault codes:
Estimated Replacement Cost
Typical cost to replace the Spark Plugs: $80 - $250 for a full set (parts and labor).
Citations & Authority References
This technical part definition is cross-referenced with:
- EPA On-Board Diagnostics II Standard Specifications
- SAE J2012 Automotive Component Design Regulations