Denso spark plugs Archives - gen1scion

DIY maintenance, part numbers

Iridium spark plugs – Denso SK20R11 (3297), NGK IFR6T11 (4589), Bosch 9603

Posted on January 11, 2025February 5, 2026 by gen1scion

Struggling with rough idle, misfires or poor MPG? Choose replacement Denso, NGK, or Bosch Iridium spark plugs for your next maintance.

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