With the curent cold weather, my (diesel) V70 (old shape) has been running very rough for a bit after a cold start - so I suspected that the glow plugs may not be operating.
This morning, before trying to start the engine, I checked all the relevant fuses and relays in the main fusebox - to make sure that the fuses were seated properly, and not blown - and the relay operated ok (when it was removed and 12v applied to its coil).
In the course of my investigation, I was curious to know whether the glowplug light on the dash indicates that the plugs are *really* on - or simply that the system *thinks* they're on. I turned the ignition on with the 15A fuse and relay removed, so that the plugs couldn't possibly operate - but the light still came on!
I didn't find anything obviously wrong, and put it all back together - after which the engine started and ran perfectly normally - with none of previous roughness.
*However* the engine check light is now on, and refuses to go off. I suspect that this was caused by turning the ignition on with the fuse out. The same fuse feeds the emission control equipment. I guess that an error code was generated, and will continue to turn on the engine check light until it is reset.Does this sound likely, or is it indicative of something more sinister? Is it a trivial (and cheap!) job for a dealer to reset it? Presumably there isn't a DIY way of doing it without access to OBD-II equipment?
TIA.