Bosch 8109 Spark Plug

Brand	Bosch 8109
Center Electrode Core Material	Nickel-Yttrium and Copper
Center Electrode Tip Material	Platinum
Ground Configuration	Standard
Ground Electrode Core Material	Copper
Ground Electrode Quantity	1
Ground Electrode Tip Design	Standard
Ground Electrode Tip Material	Platinum and Nickel-Yttrium
Hex Size	16
Insulator Material	Ceramic
Insulator Type	Projected
Manufacturer Heat Range	6
Outdoor Power Equipment Application	No
Package Contents	Spark Plug
Pre-Gap Size	1.1
Product Length	3.055118 in
Product Width	0.748031 in
Reach	19
Resistance	6000
Resistor	Yes
Seat Type	Flat
Short Style	No
Spark Plug Type	4-Cycle
Thread Diameter	14
Product line	OE Fine Wire Double Platinum
Fits	Acura and Honda · 72 vehicles

OE fine wire double platinum. Built to meet original equipment specifications for long service life.

Platinum firing pin. Helps reduce gap erosion for steadier performance over time.

Projected ceramic insulator. Supports efficient combustion and dependable ignition performance.

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Bosch OE Fine Wire Double Platinum Spark Plug 8109

Bosch 8109 is an OE Fine Wire Double Platinum spark plug built for steady ignition performance and extended service life. It uses platinum on the center electrode and a platinum inlay on the ground electrode to help reduce gap erosion while maintaining OE-style specifications for double platinum applications.

Key Features

OE Fine Wire Double Platinum design for consistent spark delivery
Platinum center electrode tip with platinum ground electrode inlay
6000 ohm resistor for ignition noise suppression
Projected ceramic insulator for stable combustion chamber exposure
Preset 1.1 mm gap; do not gap before installation
14 mm thread diameter, 19 mm reach, 16 mm hex size, flat seat
Compatible with 4-cycle ignition systems

Product Details

The Bosch OE Fine Wire Double Platinum line is built around OE spark plug technology, using durable precious-metal firing surfaces to manage wear over time. Part number 8109 is a direct-fit style spark plug for a wide range of Honda and Acura applications, including Honda Civic, Honda Accord, Honda CR-V, Honda Element, Acura TSX, and Acura TL. It is specified with a preset gap and should be installed as supplied to preserve the factory calibration. This Bosch 8109 spark plug is a practical choice for drivers servicing vehicles that call for double platinum construction and OE-level ignition characteristics.

This part cross-references common OE-style double platinum applications for Honda and Acura vehicles.

Common Uses

Rough idle caused by worn spark plug electrodes
Hard starting from weakened ignition output
Misfire codes related to plug wear or gap erosion
Reduced fuel economy from inconsistent combustion
Loss of throttle response during acceleration

Installation Notes

Fits 2002-2011 Honda Civic, N/A; do not gap, gap is preset
Fits 2003-2009 Honda Accord, N/A; without California Emission System; do not gap, gap is preset
Fits 2002-2009 Honda CR-V, N/A; do not gap, gap is preset
Fits 2003-2011 Honda Element, N/A; do not gap, gap is preset
Fits 2004-2008 Acura TL, N/A; do not gap, gap is preset
Fits 2004-2008 Acura TSX, N/A; do not gap, gap is preset

Verify engine application, emission configuration, and OE plug specification before installation. The preset gap should remain unchanged, and the plug should be torqued to the vehicle manufacturer’s specification.

Quality Assurance

Bosch manufactures this spark plug to meet Original Equipment specifications for double platinum applications. The platinum firing surfaces are used to improve durability and help maintain performance over the service interval.

This part fits 72 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Submodel	Liters	Cylinders	Fuel Type	Position	Notes
2011	Acura	CSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2011	Honda	Civic	—	1.8L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2011	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2010	Acura	CSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2010	Honda	Civic	—	1.8L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2010	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2009	Acura	CSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2009	Acura	MDX	—	3.7L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2009	Honda	Accord	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; without California Emission System; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2009	Honda	Civic	—	1.8L	L4	GAS	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2009	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2009	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Acura	CSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Acura	MDX	—	3.7L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Acura	RL	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Acura	TL	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Acura	TL	—	3.2L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Acura	TSX	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Honda	Accord	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; without California Emission System; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Honda	Civic	—	1.8L	L4	GAS	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2008	Honda	Fit	—	1.5L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Acura	CSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Acura	MDX	—	3.7L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Acura	RL	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Acura	TL	—	3.2L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Acura	TL	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Acura	TSX	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Honda	Accord	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; without California Emission System; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Honda	Accord	—	3.0L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Honda	Civic	—	1.8L	L4	GAS	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2007	Honda	Fit	—	1.5L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Acura	RL	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Acura	RSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Acura	TL	—	3.2L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Acura	TSX	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Honda	Accord	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; without California Emission System; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Honda	Accord	—	3.0L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Honda	Civic	—	1.8L	L4	GAS	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2006	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Acura	RL	—	3.5L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Acura	RSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Acura	TL	—	3.2L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Acura	TSX	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Honda	Accord	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; without California Emission System; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Honda	Accord	—	3.0L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Honda	Civic	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2005	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Acura	RSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Acura	TL	—	3.2L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Acura	TSX	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Honda	Accord	—	3.0L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Honda	Accord	DX	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; without California Emission System; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Honda	Accord	EX	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Honda	Accord	LX	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Honda	Civic	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2004	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2003	Acura	RSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2003	Honda	Accord	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; without California Emission System; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2003	Honda	Accord	—	3.0L	V6	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2003	Honda	Civic	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2003	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2003	Honda	Element	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2002	Acura	RSX	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2002	Honda	Civic	—	2.0L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
2002	Honda	CR-V	—	2.4L	L4	—	N/A	Do Not Gap, Gap is Preset; Original Center Electrode Material is Iridium; OE Fine Wire Double Platinum
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