Greg Kellerman posted an answer for this 1999 Toyota Camry:
"It was a bad vacuum hose in my case: http://www.fixya.com/cars/r25932963-p0401_error..."
Greg Kellerman wrote a tip for 1996 Toyota Camry:
"In my case this was caused by a bad hose from the Throttle Body to the EGR Vacuum..."
Greg Kellerman posted an answer for this Cars & Trucks:
"Is this the read window defroster or the windshield defroster? By die do you mean the..."
Greg Kellerman posted an answer for this 2005 Hyundai Elantra:
"Is there a Chiltons or Haynes manual available?"
Greg Kellerman posted an answer for this 2005 Dodge Caravan:
"There are way too many things that could cause this. I have not had this issue with my..."
Greg Kellerman posted an answer for this 2005 Dodge Caravan:
"I changed it on my 2005 Caravan and yes it fixed the problem. I had checked all the hoses..."