Citroen Berlingo 2017 warning triangle has appeared in instrument panel for no apparent reason, any ideas please.

Check oil , coolant and brake fluid levels are o.k


Citroën Berlingo Service Warning Triangle Warning Light
Service
The orange triangle containing an exclamation mark is a 'service' warning light an appears on the MK 2 version of the Citroën Berlingo only. The warning triangle indicates minor faults when temporarily lit, or major fault if the light stays on constantly. Check the fault log under diagnostics in the trip computer for an indication of the problem. If there are no warning logs stored, diagnostic equipment is required to read fault codes. Fault codes are not always stored in the trip computer, in this instance, there can be codes stored in the ECU that only an OBD tool will read. The service warning triangle may illuminate alone or with another warning light.
Service warning light and other warnings
Citroën Berlingo Service Warning Triangle Warning Light + Citroën Berlingo Tyre Pressure Monitoring System Warning Light = Flashing tyre pressure warning and warning triangle indicates the tyre pressure monitoring system has a fault or no sensor has been detected in one of the wheels.
Citroën Berlingo Service Warning Triangle Warning Light + Citroën Berlingo AdBlue Warning Light = Flashing UREA / warning triangle plus audible signal and message to indicate a limited range between 0 - 370 miles (0 - 600 km) before AdBlue tank is empty. Top up AdBlue to avoid breakdown.
Citroën Berlingo Service Warning Triangle Warning Light + Citroën Berlingo AdBlue Warning Light = Flashing UREA / warning triangle plus audible signal and message to indicate that starting has been prevented. AdBlue tank is empty and the starting inhibition system required by regulations prevents the starting of the engine. To enable starting of the engine, at least 5 litres of AdBlue must be added to the tank.
Citroën Berlingo Service Warning Triangle Warning Light + Citroën Berlingo AdBlue Warning Light + Citroën Berlingo Engine Self-diagnosis (check engine) Warning Light = UREA / warning triangle / engine self-diagnosis (check engine) plus audible signal. A temporary fault with the SCR emissions control system has been detected. Once the exhaust emissions return to normal the warning lights will go out.
Citroën Berlingo Service Warning Triangle Warning Light + Citroën Berlingo AdBlue Warning Light + Citroën Berlingo Engine Self-diagnosis (check engine) Warning Light = Flashing UREA / warning triangle / engine self-diagnosis (check engine) plus audible signal and message indicating the remaining driving range. You can continue driving for up to 685 miles (1,100 km) until the engine inhibition system is triggered. Contact a Citroën workshop.
Citroën Berlingo Service Warning Triangle Warning Light + Citroën Berlingo AdBlue Warning Light + Citroën Berlingo Engine Self-diagnosis (check engine) Warning Light = Flashing UREA / warning triangle / engine self-diagnosis (check engine) plus audible signal and message indicating the prevention of starting the engine. The authorised driving limit has been exceeded. A fault has been detected with the emissions control system. Contact a Citroën workshop.

Many thanks. It's a petrol version. I have been through the motions before posting my request but without success. Citroen dealer doesn't want to know the car as it is a Category S vehicle. local garage is going to see what they can do next week.

Would have thought there would be a fault code stored that could be retrieved by scanning ?