Why Has This Lintel Cracked?

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Roger looks at a problem with a concrete lintel.

Here’s the message from Ryan:

Hi, so about 6 months ago, I had this arch open extended.

For the last three months, the lintel below the wall has been cracking.

The wall on the left has not cracked at all.

The wall that is cracking is on the side of the house against a main road.

I wondered if this is a problem, if this lintel must be replaced or if it can be repaired with something like a helical bar or studs through the lintel into the wall above it.

Thanks,

Ryan