Bosch
OE Fine Wire Iridium

Bosch 9735 Spark Plug

Brand Bosch 9735
Resistance 6000
Ground Electrode Tip Design Standard
Ground Configuration J-gap
Ground Electrode Core Material Copper
Electrical Terminal Type Non-removable nut
Center Electrode Core Material Copper
Center Electrode Tip Material Iridium
Pre-Gap Size .7
Ground Electrode Quantity 1
Hex Size 16
Manufacturer Heat Range 6
Seat Type Flat
Reach 19
Insulator Material Ceramic
Resistor Type Yes
Ground Electrode Tip Material Platinum
Hex Type Hex
Center Electrode Design Fine wire
9746 No
Additional Accessories Included No
Automotive Item Weight (lbs) 0.092594 lb
Insulator Type Non-projected
Outdoor Power Equipment Application No
Package Contents Spark plug
Package Quantity 1
Private Brand? No
Product Length 3 in
Product Width 0.748031 in
Resistor Yes
Short Style No
Product line OE Fine Wire Iridium
Fits Audi, Mitsubishi, and Volkswagen · 43 vehicles

OE Fine Wire Iridium. Bosch OE-style spark plug technology for strong performance and long service life.

Iridium center electrode. Ultra-fine wire design helps deliver crisp, efficient firing.

Resistor type. Helps reduce electrical noise in the ignition system.

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Bosch OE Fine Wire Iridium Spark Plug 9735

Bosch 9735 is an OE Fine Wire Iridium spark plug built for consistent ignition performance and extended service life. It uses an ultra-fine wire iridium center electrode to support efficient firing, stable combustion, and reliable starts in the vehicles listed below.

The Bosch OE Fine Wire Iridium line focuses on original-equipment style ignition performance with a fine-wire electrode design, resistor construction, and a 14 mm thread diameter. For drivers searching for a Bosch spark plug for Audi A8 Quattro, Audi A6 Quattro, Audi S6, Audi S8, Audi Q7, Audi S5, Mitsubishi Eclipse, Mitsubishi Lancer, Mitsubishi Galant, or Volkswagen Touareg, part number 9735 matches the specified applications.

Key Features

  • OE Fine Wire Iridium design for precise spark delivery
  • Iridium center electrode tip with fine-wire construction
  • Platinum ground electrode tip material with standard J-gap configuration
  • Resistor spark plug with 6000 resistance
  • Flat seat, 16 mm hex, and 19 mm reach
  • Ceramic insulator and non-removable nut terminal
  • Pre-gapped to .7 for the listed applications
  • Bosch part number 9735

Product Details

Bosch 9735 is a 4-cycle spark plug engineered around OE-style ignition requirements. The fine wire iridium center electrode helps concentrate the spark for dependable ignition response, while the resistor design supports electrical noise suppression in modern ignition systems. With a copper core center electrode and copper core ground electrode, this plug is built to manage heat transfer within the specified heat range 6 construction.

This Bosch OE Fine Wire Iridium spark plug is listed for 2006-2012 Mitsubishi Eclipse, 2008-2010 Mitsubishi Lancer, 2007-2009 Mitsubishi Galant, 2007-2012 Audi A8 Quattro, 2007-2011 Audi A6 Quattro, 2007-2011 Audi S6, 2007-2010 Audi Q7, 2007-2009 Audi S8, 2009-2012 Audi S5, and 2007-2009 Volkswagen Touareg. If you are replacing worn plugs on an Audi A8 Quattro or Volkswagen Touareg, Bosch 9735 provides the specified OE Fine Wire Iridium configuration.

Common Issues This Part Can Address

  • Hard starting caused by worn spark plug electrodes
  • Rough idle from inconsistent ignition firing
  • Misfire conditions related to degraded plug performance
  • Reduced throttle response from weak spark delivery
  • Maintenance replacement for high-mileage ignition service

Installation Notes and Tips

Verify the engine application against the listed fitment before installation. Check the plug gap against the vehicle specification, inspect ignition coils and boots for wear, and confirm the 14 mm thread diameter, 19 mm reach, and flat seat match the cylinder head requirements. Use proper spark plug service procedures to avoid cross-threading or over-tightening.

Quality Assurance

Bosch designs OE Fine Wire Iridium spark plugs to meet original-equipment style ignition standards with durable electrode materials and consistent electrical performance. Part number 9735 is built for the listed Audi, Mitsubishi, and Volkswagen applications and follows Bosch ignition component engineering practices.

This part fits 43 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersFuel TypeNotes
2012AudiA8 Quattro4.2LV8OE Fine Wire Iridium
2012AudiS54.2LV8OE Fine Wire Iridium
2012MitsubishiEclipse3.8LV6OE Fine Wire Iridium
2011AudiA6 Quattro4.2LV8OE Fine Wire Iridium
2011AudiA8 Quattro4.2LV8OE Fine Wire Iridium
2011AudiS54.2LV8OE Fine Wire Iridium
2011AudiS65.2LV10OE Fine Wire Iridium
2011MitsubishiEclipse3.8LV6OE Fine Wire Iridium
2010AudiA6 Quattro4.2LV8OE Fine Wire Iridium
2010AudiA8 Quattro4.2LV8OE Fine Wire Iridium
2010AudiQ74.2LV8GASOE Fine Wire Iridium
2010AudiS54.2LV8OE Fine Wire Iridium
2010AudiS65.2LV10OE Fine Wire Iridium
2010MitsubishiEclipse3.8LV6OE Fine Wire Iridium
2010MitsubishiLancer2.0LL4OE Fine Wire Iridium
2009AudiA6 Quattro4.2LV8OE Fine Wire Iridium
2009AudiA8 Quattro4.2LV8OE Fine Wire Iridium
2009AudiQ74.2LV8GASOE Fine Wire Iridium
2009AudiS54.2LV8OE Fine Wire Iridium
2009AudiS65.2LV10OE Fine Wire Iridium
2009AudiS85.2LV10OE Fine Wire Iridium
2009MitsubishiEclipse3.8LV6OE Fine Wire Iridium
2009MitsubishiGalant3.8LV6OE Fine Wire Iridium
2009MitsubishiLancer2.0LL4OE Fine Wire Iridium
2009VolkswagenTouareg4.2LV8OE Fine Wire Iridium
2008AudiA6 Quattro4.2LV8OE Fine Wire Iridium
2008AudiA8 Quattro4.2LV8OE Fine Wire Iridium
2008AudiQ74.2LV8GASOE Fine Wire Iridium
2008AudiS65.2LV10OE Fine Wire Iridium
2008AudiS85.2LV10OE Fine Wire Iridium
2008MitsubishiEclipse3.8LV6OE Fine Wire Iridium
2008MitsubishiGalant3.8LV6OE Fine Wire Iridium
2008MitsubishiLancer2.0LL4OE Fine Wire Iridium
2008VolkswagenTouareg4.2LV8OE Fine Wire Iridium
2007AudiA6 Quattro4.2LV8OE Fine Wire Iridium
2007AudiA8 Quattro4.2LV8OE Fine Wire Iridium
2007AudiQ74.2LV8OE Fine Wire Iridium
2007AudiS65.2LV10OE Fine Wire Iridium
2007AudiS85.2LV10OE Fine Wire Iridium
2007MitsubishiEclipseGT3.8LV6OE Fine Wire Iridium
2007MitsubishiGalant3.8LV6OE Fine Wire Iridium
2007VolkswagenTouareg4.2LV8OE Fine Wire Iridium
2006MitsubishiEclipse3.8LV6OE Fine Wire Iridium