Hi guys, we have just serviced a 130 pd audi a4, the battery went flat over night and when we came back to it this morning the oil pressure warning light comes on when the engine is started, we have had a similar problem with passats in the past with oil level light, that has been a hardware fault in the dash, rectified by disconnecting the battery, we have tried this but it did not work, the actual values show oil pressure ok in vag com, we service loads of these with no problems, any one had this b4? many thanks James