Ok so a while back i attempted to replace my plugs, 3 came out okay and the 4th came out without the BOTTOM off it attached, it initially screwed out okay but the tip was left in the engine.

Only option I had was fitting the 3 good ones and trying to put the 4th back on.

At the same time i cleaned the egr valve, boost sensor etc, which is running well seemingly....

Altho now im getting the spanner light constantly.

The problem plug, is on tight, but doesnt seem to be screwed in completely.

Any idea on both if thats 1) okay and 2) how to get rid off the spanner light on dash (i had disconnected battery as was getting the light because off the egr valve, doesnt solve prob)