Denso 3191 Spark Plug
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Denso
 U-Groove Conventional

Denso 3191 Spark Plug

Brand Denso 3191
Center Electrode Core Material Copper
Center Electrode Tip Material Nickel
Ground Configuration Standard
Ground Electrode Core Material Nickel
Ground Electrode Quantity 1
Ground Electrode Tip Design U-Groove
Hex Size 16.0
Manufacturer Heat Range 16
Pre-Gap Size 0.8
Reach 19.00
Resistance 5000
Seat Type Flat
Thread Diameter 14.00
Product line U-Groove Conventional
Fits Toyota, Chrysler, Hyundai, Polaris, Kia, Mercedes-Benz, Land Rover, Volkswagen, Bentley, Nissan, INFINITI, Dodge, Jeep, and Eagle · 133 vehicles

U-Groove design. Improves ignitability for more efficient engine performance.

Copper core. Helps promote consistent spark delivery.

Conventional spark plug. A straightforward secondary ignition replacement.

Cross-references American Motors 5600 6240, Chrysler 5600 6240 and Datsun/Nissan 22401-20J05 for the same application. See all 14.

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Denso 3191 U-Groove Spark Plug

Denso 3191 is a conventional spark plug built for steady ignition performance in a wide range of import and domestic applications. Its U-Groove ground electrode design helps improve ignitability for more efficient combustion, making it a practical choice for drivers servicing older Mercedes-Benz, Hyundai, Kia, Nissan, and Toyota models.

Key Features

  • U-Groove ground electrode tip design for improved spark exposure
  • Nickel ground and center electrode tip materials with a copper core center electrode
  • 5000 ohm resistance for ignition system compatibility
  • Pre-gapped to 0.8 mm for straightforward service replacement
  • Flat seat, 14 mm thread diameter, 19.00 mm reach, and 16.0 mm hex size
  • Manufacturer heat range 16 for specified OE-style applications

Product Details

The Denso U-Groove Conventional line focuses on dependable secondary ignition performance with a design that promotes better ignitability. Part number 3191 uses a nickel-tipped U-groove ground electrode and a copper-core center electrode to support consistent spark delivery in everyday driving conditions. This spark plug is a direct service option for applications such as 2005-2007 Hyundai Santa Fe, 2005-2006 Mercedes-Benz CL500, and 2015-2016 Toyota Prius C, along with additional coverage across Chrysler, Nissan, Infiniti, Jeep, Volkswagen, Bentley, and other listed vehicles. Denso 3191 is also cross-referenced to DENSO Auto Parts K16PR-U for the same application.

What It Helps Address

  • Hard starting caused by worn or fouled spark plugs
  • Rough idle from weak or inconsistent ignition output
  • Misfire conditions related to aged secondary ignition components
  • Reduced fuel efficiency from incomplete combustion
  • Loss of throttle response in high-mileage ignition service intervals

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the original plug before installation. This part is listed for vehicles including 2005 Hyundai Sonata, 1998-2000 Nissan Sentra, and 2004 Mercedes-Benz E500, so confirm the exact engine application and any special service notes before replacing plugs. Some Mercedes-Benz applications note that two spark plugs are required per cylinder; follow the vehicle service procedure and torque specification for the engine being serviced.

Quality Assurance

Denso manufactures this spark plug as part of its U-Groove Conventional line, using a design intended to improve ignitability and support efficient engine operation in specified applications. Part number 3191 is built to the listed OE-style dimensions and electrical characteristics for accurate replacement service.

Related reading

This part fits 133 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2016ToyotaPrius CN/AU-Groove Conventional
2015ToyotaPrius CN/AU-Groove Conventional
2007ChryslerCrossfireN/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2007HyundaiSanta FeN/AU-Groove Conventional
2006ChryslerCrossfireN/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2006HyundaiSanta FeN/AU-Groove Conventional
2006KiaSpectra5N/AU-Groove Conventional
2006Mercedes-BenzCL500N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2005ChryslerCrossfireN/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2005HyundaiElantraN/AU-Groove Conventional
2005HyundaiSanta FeN/AU-Groove Conventional
2005HyundaiSonataN/AU-Groove Conventional
2005HyundaiXG350N/AU-Groove Conventional
2005Land RoverFreelanderN/AU-Groove Conventional
2005Mercedes-BenzC240N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2005Mercedes-BenzC320N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2005Mercedes-BenzCL500N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2005Mercedes-BenzCLK320N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2004Mercedes-BenzE500N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2003Mercedes-BenzC240N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2002Mercedes-BenzC240N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2002Mercedes-BenzSL600N/AU-Groove Conventional
2002VolkswagenCabrioN/AU-Groove Conventional
2001BentleyAzureN/AU-Groove Conventional
2001BentleyContinentalN/AU-Groove Conventional
2001Mercedes-BenzC240N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2001VolkswagenCabrioN/AU-Groove Conventional
2000BentleyAzureN/AU-Groove Conventional
2000BentleyContinentalN/AU-Groove Conventional
2000Mercedes-BenzC280N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
2000Mercedes-BenzSL600N/AU-Groove Conventional
2000NissanSentraN/AU-Groove Conventional
2000VolkswagenCabrioN/AU-Groove Conventional
1999BentleyAzureN/AU-Groove Conventional
1999BentleyContinentalN/AU-Groove Conventional
1999INFINITIG20N/AU-Groove Conventional
1999Mercedes-BenzC280N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
1999NissanSentraN/AU-Groove Conventional
1998Mercedes-BenzC280N/ATwo spark plugs are required per cylinder.; U-Groove Conventional
1998Nissan200SXN/AU-Groove Conventional
1998NissanSentraN/AU-Groove Conventional
1997BentleyAzureN/AU-Groove Conventional
1997BentleyBrooklandsN/AU-Groove Conventional
1997BentleyTurbo RN/AU-Groove Conventional
1997DodgeRam 1500N/AU-Groove Conventional
1997DodgeRam 2500N/AU-Groove Conventional
1997DodgeRam 3500N/AU-Groove Conventional
1997Mercedes-BenzC36 AMGN/AU-Groove Conventional
1996BentleyAzureN/AU-Groove Conventional
1996BentleyBrooklandsN/AU-Groove Conventional
1996BentleyContinentalN/AU-Groove Conventional
1996BentleyTurbo RN/AU-Groove Conventional
1996DodgeB1500N/AU-Groove Conventional
1996DodgeB2500N/AU-Groove Conventional
1996DodgeB3500N/AU-Groove Conventional
1996DodgeDakotaN/AU-Groove Conventional
1996DodgeRam 1500N/AU-Groove Conventional
1996DodgeRam 2500N/AU-Groove Conventional
1996DodgeRam 3500N/AU-Groove Conventional
1996INFINITIG20N/ASpark plug with a hot heat range; U-Groove Conventional
1996JeepGrand CherokeeN/AU-Groove Conventional
1996Mercedes-BenzC280N/AU-Groove Conventional
1996Mercedes-BenzE320N/AU-Groove Conventional
1996Mercedes-BenzS320N/AU-Groove Conventional
1996Mercedes-BenzSL320N/AU-Groove Conventional
1995BentleyBrooklandsN/AU-Groove Conventional
1995BentleyContinentalN/AU-Groove Conventional
1995BentleyTurbo RN/AU-Groove Conventional
1995DodgeB1500N/AU-Groove Conventional
1995DodgeB2500N/AU-Groove Conventional
1995DodgeB3500N/AU-Groove Conventional
1995DodgeDakotaN/AU-Groove Conventional
1995DodgeRam 1500N/AU-Groove Conventional
1995DodgeRam 2500N/AU-Groove Conventional
1995DodgeRam 3500N/AU-Groove Conventional
1995INFINITIG20N/ASpark plug with a hot heat range; U-Groove Conventional
1995JeepGrand CherokeeN/AU-Groove Conventional
1995Mercedes-BenzC280N/AU-Groove Conventional
1995Mercedes-BenzC36 AMGN/AU-Groove Conventional
1995Mercedes-BenzS320N/AU-Groove Conventional
1995Mercedes-BenzSL320N/AU-Groove Conventional
1994BentleyBrooklandsN/AU-Groove Conventional
1994BentleyContinentalN/AU-Groove Conventional
1994BentleyTurbo RN/AU-Groove Conventional
1994DodgeB150N/AU-Groove Conventional
1994DodgeB250N/AU-Groove Conventional
1994DodgeB350N/AU-Groove Conventional
1994DodgeDakotaN/AU-Groove Conventional
1994DodgeRam 1500N/AU-Groove Conventional
1994DodgeRam 2500N/AU-Groove Conventional
1994DodgeRam 3500N/AU-Groove Conventional
1994INFINITIG20N/ASpark plug with a hot heat range; U-Groove Conventional
1994JeepGrand CherokeeN/AU-Groove Conventional
1994Mercedes-BenzC280N/AU-Groove Conventional
1994Mercedes-BenzS320N/AU-Groove Conventional
1994Mercedes-BenzSL320N/AU-Groove Conventional
1993BentleyBrooklandsN/AU-Groove Conventional
1993BentleyContinentalN/AU-Groove Conventional
1993BentleyTurbo RN/AU-Groove Conventional
1993DodgeB150N/AU-Groove Conventional
1993DodgeB250N/AU-Groove Conventional
1993DodgeB350N/AU-Groove Conventional
1993INFINITIG20N/AU-Groove Conventional
1993JeepGrand CherokeeN/AU-Groove Conventional
1993JeepGrand WagoneerN/AU-Groove Conventional
1992BentleyMulsanneN/AU-Groove Conventional
1992BentleyTurbo RN/AU-Groove Conventional
1992DodgeB150N/AU-Groove Conventional
1992DodgeB250N/AU-Groove Conventional
1992DodgeB350N/AU-Groove Conventional
1992INFINITIG20N/AU-Groove Conventional
1991BentleyContinentalN/AU-Groove Conventional
1991BentleyEightN/AU-Groove Conventional
1991BentleyMulsanneN/AU-Groove Conventional
1991BentleyTurbo RN/AU-Groove Conventional
1991INFINITIG20N/AU-Groove Conventional
1991JeepGrand WagoneerN/AU-Groove Conventional
1990BentleyContinentalN/AU-Groove Conventional
1990BentleyEightN/AU-Groove Conventional
1990BentleyMulsanneN/AU-Groove Conventional
1990BentleyTurbo RN/AU-Groove Conventional
1989BentleyContinentalN/AU-Groove Conventional
1989BentleyEightN/AU-Groove Conventional
1989BentleyMulsanneN/AU-Groove Conventional
1989BentleyTurbo RN/AU-Groove Conventional
1988BentleyContinentalN/AU-Groove Conventional
1988BentleyEightN/AU-Groove Conventional
1988BentleyMulsanneN/AU-Groove Conventional
1987BentleyEightN/AU-Groove Conventional
1986BentleyContinentalN/AU-Groove Conventional
1986BentleyMulsanneN/AU-Groove Conventional
1985BentleyMulsanneN/AU-Groove Conventional
1984BentleyMulsanneN/AU-Groove Conventional
Directly replaces or cross-references 14 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
American Motors — 5600 6240Chrysler — 5600 6240Datsun/Nissan — 22401-20J05DENSO Auto Parts — K16PR-UGeneral Motors — 5614286General Motors — 19302726General Motors — 19307140General Motors — 88901014Mazda — 0K23A-18-110Mercedes-Benz — 003 159 31 03Mitsubishi — 5600 6240Mitsubishi — MS851571Peugeot — 5962H8Peugeot — 5962J1