A P1406 error code on a 1996 Pontiac Sunfire indicates a faulty EGR valve. This can result in poor engine performance and should be replaced immediately.
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Are you sure about that code? I'm not seeing it in the ODBII code list. http://autorepair.about.com/od/obdcodedatabase/a/OBD_1996_year.htm
cant you need a scanner to check codes from 1996 and newer
P1300 is a Boost Calibration Fault. For more info, you'll have to talk to yourmechanic.(from this source) http://www.troublecodes.net/OBD2/Pcodes.shtml
The country code and area code of Abington, United Kingdom is 44, (0)1864.
the code is US0374 in it's American and will be changed to EU6392 if it's been shipped to Europe
check the piece of cardboard where the spare tire is. it should be on there
Trouble code P0440 means: EVAP System No Flow During Purge
Trouble code P0300 means:Random/multiple cylinder misfire detected
Google that code and you will have the answer. It is a pressure circuit code in the transmission
You dont and even after they are hooked back up the code would have most likely been erased after the battery was disconnected.