Under the silver cover on the valve cover. You remove it with 10mm socket.
gap on sparkplug for 2007 honda civic si
4
The best spark plug for a stock civic si is ngk.
go to auto zone and give description of car ask for bosch spark plugs they come with the gap specialized to ure car specification.
The price range for a 2007 Honda Civic SI can really vary depending on it's features and mileage. Kelly Blue Book has the 2007 Honda Civic SI at about $12,000.
19mm
44
8th gen civic si's have electric power steering,
Any engine lite usually means emission problems. Your spark plugs or wires could be faulty or just dirty.
19mm
Most plugs are pre gapped. You can also check the emissions sticker under the hood or the car's manual, it should have the correct gap settings.
I don't think you can