Good evening

The car in question Citroen C4 1.4 16V with LPG had the Mil indicator light switched on following a service interval carried out in the workshop for an engine oil change and a complete car overhaul.

After a few days the car returned to the workshop with the mil light on

In the engine ecu diagnosis were present :

error p0948 oil pressure solenoid valve control

error p2074 suction pressure maximum flow

The oil pressure, oil pressure solenoid valve, air intake pipes were checked.

At the end of the checks, the problem was solved after checking whether the engine was sucking in air abnormally.

We detected the presence of an abnormal flow of air from the oil filler/intake plug into the engine.

The cap was NOT closed properly and was letting air into the engine.

After correctly closing the cap the problem was solved

good work and best regards Antonio