diff --git a/pyren3/mod_term.py b/pyren3/mod_term.py
index 81e1f20..45bdf0a 100755
--- a/pyren3/mod_term.py
+++ b/pyren3/mod_term.py
@@ -225,7 +225,7 @@ def optParser():
   parser.add_argument("--caf",
       help="turn on CAN Auto Formatting. Available only for OBDLink",
       dest="caf",
-      default=True,
+      default=False,
       action="store_true")
 
   parser.add_argument("--n1c",