Iridium Spark Plug – GM (12681663)

Iridium Spark Plug converts a physical condition into a signal the powertrain module acts on. The module compares that signal against an expected range at every start-up, so a failing unit is usually logged before it becomes a driveability complaint.

Replace the Iridium Spark Plug when the fault repeats with the harness already ruled out, when resistance drifts as the part heats up, or when a connector has corroded past cleaning. Swapping a sensor to chase a wiring fault is the most common wasted repair on these circuits.

For this Iridium Spark Plug the reference is 12681663, in our Spark Plugs & Ignition range. Compare it with the number on the part you are replacing rather than with a photograph.

This is genuine GM stock, supplied for the Iridium Spark Plug with the manufacturer number intact so the reference on the box matches the catalogue.