12:th-Aug-2020, 17:11:56
i have a 2014 astra j gtc 1.4t, i keep getting a p0420 fault code , any ideas on what i should be looking for to rectify whatever problem it is , as soon as i clear the code my engine runs perfectly then 2-3 days later it gets a misfire at about 2500-3000 rpm , thank you in advance