Bosch YR78X Spark Plug
Specs, cross-brand equivalents, vehicle fitment, and live prices for the Bosch YR78X.
The Bosch YR78X is a 12mm thread, 19mm reach, copper electrode spark plug, pre-gapped to 0.043. These specifications are decoded from the Bosch part number and determine which plugs it safely cross-references to — a valid equivalent must match the thread, reach, seat and heat range.
Cross-reference equivalents
| Brand | Part | Metal | Buy |
|---|---|---|---|
| Champion | CET1SB | Copper | Buy |
| Champion | EON10287 | Copper | Buy |
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