Over the last 6 months I've had 2 dash warning lights come on intermittently, so I thought I'd buy myself an OBD2 reader to try and see what's going on. Spent nearly $200 on a Foxwell NT301, connected it up this morning but no diagnostic codes were detected. Is it me not using the device correctly...

Recently bought a Foxwell NT510 (use it for Land Rover and 2009 Passat CC 2.0L TDI - has software for both vehicles loaded).

Anyway, yesterday and today noticed the glowplug amber light (wife descriptively calls it the "Curly Wurly" light) came on and started flashing, then of...