DENSO Auto Parts Spark Plug P/N:4101
DENSO Auto Parts 3443 spark plug for the 2000-2009 Subaru Outback H4 2.5L and other vehicles ignites the air-fuel mixture in each cylinder. This Iridium Long-Life plug is manufactured to OE performance, durability and emissions standards.
Worn plugs can show up as hard starting, a rough idle or a misfire. Before you replace them, rule out a weak coil, damaged wiring or a fuel problem, since any of these can also make an engine misfire. Each engine takes one plug per cylinder.
These are Subaru Outback spark plugs for the 2000-2009 H4 2.5L. The 1998-2004 Subaru Forester H4 2.5L and the 1999-2000 Honda Civic 4-cylinder 1.6L also take this plug, along with many other vehicles.
Fit and size
Build and materials
Product information is for general reference and may contain errors. See our Disclaimer.
Are these Subaru Forester spark plugs correct for the 1998-2004 H4 2.5L?
Yes. DENSO Auto Parts 3443 fits the 1998-2004 Subaru Forester H4 2.5L, which takes four plugs. If your car is not named here, look it up in the Vehicles it fits section.
Is this the right Honda Civic spark plug for the 1999-2000 4-cylinder 1.6L?
Yes. DENSO Auto Parts 3443 fits the 1999-2000 Honda Civic 4-cylinder 1.6L, and that engine takes four plugs.
What are the thread size and reach of this DENSO iridium plug?
The thread diameter is 14.0 mm, the reach is 19.0 mm and the hex size is 16 mm. The seat is flat, and the plug comes pre-gapped at 1.1 mm.
Does this DENSO spark plug have an iridium tip?
Yes. The center electrode tip is iridium on a copper core. The ground electrode has a platinum chip tip on a nickel core.
How long does the iridium last on this DENSO plug?
The patented alloy is over 90% iridium with small amounts of rhodium added to reduce oxidation, and it is made for durability of over 110,000 miles.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.