DENSO IW27equivalent & cross reference
The DENSO IW27 spark plug is directly equivalent to NGK BR9ES and NGK BR9EIX and NGK BR10EIX, confirmed by shared applications in both manufacturers' official catalogues.
Equivalents
| Part | Shared applications | Agreement |
|---|---|---|
| NGK BR9ES | 13 | 87% |
| NGK BR9EIX | 23 | 82% |
| NGK BR10EIX | 9 | 82% |
Verified fitments for the DENSO IW27
Equivalence confirmed by 3 independent sources, last verified 22 July 2026. Always confirm fitment against your owner's manual.