Hi, Noticed my revs have been a bit high when idleing and the EML came on today so used my code reader and came back with P0507. Bit of research says it might be PCV valve but all posts are for turbo engines which mine isn't. Do non turbo engines have PCV valves? My engine code is BLX. Fuel consumption is pretty bad aswell. Could I check anything else obvious before forking out at a garage?