usually the rich/lean (on older neons) condition means one of two things, your cat is going, or you need to replace the 02
once the 02 gives NO reading, then it throws the malf o2 sensor code
usually the rich/lean (on older neons) condition means one of two things, your cat is going, or you need to replace the 02
once the 02 gives NO reading, then it throws the malf o2 sensor code