12.5 12 3 520 C120030 Removing and installing coil and ignition lead • Remove fuel tank. e Caution: Switch off ignition. Disconnect ground (earth) cable at battery and insulate it. • Pull off spark plug cap with special puller, BMW No. 12 3 520. • Release threaded connection for central electri- cal equipment box. • Remove ignition leads. Check ignition coil resistance • Test with BMW MoDiTeC.