Spark Plug Standard - Denso Resistor NP-3121

Spark Plug - U-Groove Conventional | Gap .044 | O.E. Recommended Resistor Plug with Patented U-Groove Design

Spark plugs ignite the compressed air/fuel mixture in each cylinder, and their condition directly affects combustion efficiency, fuel economy, and emissions. Signs of worn plugs include: difficulty starting, a rough idle, a hesitation or misfire under acceleration, reduced fuel economy, or a check engine light with misfire codes. Replace spark plugs on schedule - new plugs restore clean ignition performance and can noticeably improve fuel economy.

Denso Resistor spark plugs feature traditional copper-core design with built-in resistors to suppress electromagnetic interference. As original equipment on millions of vehicles, these plugs deliver reliable performance and good value.

This part also fits:

• 1999 Subaru Impreza RS Manual Trans.
• 2000 Subaru Impreza RS Manual Trans.
• 2001 Subaru Impreza L
• 2001 Subaru Impreza RS Manual Trans.
• 2002 Subaru Impreza RS Manual Trans.
• 2003 Subaru Impreza RS Manual Trans.