What could cause rough running engine and check engine light on a 2002 land rover discovery?

Answer 1

That one is abit like asking how long is a piece of string?. I assume this is a V&8 and not a diesel First are you running the right grade of fuel? Discos need high grade fuel - at least 91 pump octane - and using regular unleaded can trigger the SES light. It ususlly takes a couple fo tanks of the good stuff for the light to go out. The light can also be triggered by a loose fuel cap so check that though I woudln't expect it to cause rough running Bad igintion leads is another candidate and the only way to check this is to replace them and see if things get better. Depending on the car's milage you may want to consider a new set of plugs as well. Now if none of these is the cause then you probaly need a trip to a shop that knows about Land Rovers - it doesn't need to be a dealer as there are plenty of independent specialist shops who know what they are doing but they should be L-R specialists and not just any local garage. They will plug in the scanner and pull the codes which will lhelp them diagnose the problem. Some possible causes include low fuel pressure, a bad mass air flow meter, dirty/sticking injectors, and a host of other possibilities