A candle key is required for work at 16. It will also require a peat key to circle the spark plugs above the spark plugs. The coils need to be kept on all motors, except for 1.6. It's enough to pull the high voltage wires upward to gain access to the spark plugs. You do not need to disconnect the battery terminals and the ignition (s).
Once you have access to the candles, you have to take a candle and throw it on one of the candles. You need to insert something strong and create a good lever into the technology hole of the candle-key, as you will have to apply a serious effort.