SOURCE: Check Engine Light with Code P0072 on 2004 Volvo XC90
Grounding issue "Circuit low" = ground wire problem or another system on the same circuit using too much current.
Check all wiring issues and then correct the issue to have the code go away :)
SOURCE: oil pressure light on at idle for Volvo S40 MY2005 B5244S4 Engine
Since you are going to check the one way valve and cleaning the filter too, I would recommend to check the intake air filter and clean it throughly. After that use carb cleaner to free up the nozzles of the injector valve . If the engine sound better after using carb cleaner, add some into the fuel from the fuel filter or pump, whichever one has easy access, and gun your engine in short bursts, after which it should run better.........sodeep
SOURCE: my volvo xc90 looses power when pulling, engine
overheating or going into limp mode....restart just resets the pcm
SOURCE: Volvo xc90 daytime running lights
I'm not sure about your model, but some Volvos come with a little screwdriver hole adjacent to the headlight switch that you can turn to shut the DRL off. I believe the slot needs to be horizontal to be in the off position.
Good luck!!
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