I have a 2005 Altima SER 3.5 with 46,000 miles on it. My service engine soon light came on and had a code of 1402. I looked up the code and it said EGR high flow detected. I was wondering if anyone could help me diagnose this problem and tell me where if it is the egr valve what it looks like on a 3.5 and where it is located at. Thanks