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[Doctor Gollum]

Either book it in and get it done or wait ten days and DIY...

That garage seems to be well reviewed, so may be the best bet

[Nick W]

Are we all agreed that the fault is the thermostat, as IanSoutham believes? It makes sense to me. I have changed two on Merivas, not a big job. I don't know garages in Enfield, Catherine fancies Greenfox. Should I send her there, with instructions to change the thermostat, or ask them to diagnose the fault and rectify it, suggesting thermostat?

No, because without some simple work it's a guess. And that is a shitty way to fix anything.
It could be the thermostat, or the sensor, or the wiring, or the moon out of alignment.


If you can't fix it for her, have your daughter book into her favoured garage and explain the symptoms she originally noted AND NOTHING ELSE!!!! Then they can fix it properly

[Marks DTM Calib]

So first things first

Battery - needs charging and/or replacing - slow crank, never good and can trigger all sorts of other incorrectly flagged DTCs

For the DTC there should be more than just P0115 (there certainly will be if you do the pedal test), I would expect an extra two digits which gives the symptom, the first four only identify the circuit at fault.

No diag can be made without these two items, any other suggestions are just random guesswork