error codes [Archive] - Forum


View Full Version : error codes

03-24-2008, 06:26 AM
i went 2 advanced auto 2day and the thingy said i have code numbers

P0300 random/multiple cylinder misfire detected
P0400 Evap emission control system malfunction

what do these mean exactly?

03-24-2008, 10:24 AM
The P0300 code means you have a spark plug or a few of them that are probably bad and need changed, or you have some plug wires that are bad, you could have a loose connection between the spark plug and the plug boot too. But its definetely a spark plug/plug wire problem. Check your connections and make sure everything is tight sometimes they get loose. You might just have to change your plugs and wires though. I think the P0400 code is the EGR valve, its probably going bad. I had to change mine out a few months ago and I just had the cylinder misfire problem this weekend.