4237 400 1302 STIHL Ignition Module – Genuine OEM Ignition System Part4237 400 1302 STIHL Ignition Module Genuine OEM Ignition System Part The STIHL Ignition Module (4237 400 1302) is a genuine OEM electronic ignition component designed to deliver consistent spark timing and reliable engine performance in select STIHL professional hedge trimmers. This module controls ignition timing and generates the high voltage spark required for proper combustion. Over time, ignition modules may fail due to heat exposure, vibration,