to303Modelo 303. IVA. Autoliquidación. Modelo 308. IVA. Régimen Especial del Recargo Equivalencia, artículo 30 bis del Reglamento del IVA y sujetos pasivos ocasional.If you have scanned your engine computer to see what’s causing trouble and found the P0303 code, you mht wonder what is going on and how to fix it. Thankfully, it doesn’t