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HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 5581
Experience:  25 years Auto experience, Ford ,GM, Chrysler, Asian & European
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Have a PO 455 Large evap leak on my 2005 tauras. Don't know

Customer Question

Have a PO 455 Large evap leak on my 2005 tauras. Don't know were to start??
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: Brand new battery.
JA: What is the model of your '05 Ford?
Customer: Tauras 3.0
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Trying. Had filler neck replaced about 1 1/2 ago. not a very good shop. I was thinking it was this again. Same code when I replaced neck last time.
JA: Anything else you want the mechanic to know before I connect you?
Customer: not that I can think of.
Submitted: 3 months ago.
Category: Ford
Expert:  HDGENE replied 3 months ago.

Hello, and thank you for using Just Answer! My name is***** me a few moments to review your question and Ill do my best to assist you.

Expert:  HDGENE replied 3 months ago.

Hello, this will be a difficult thing for you to check without the use of a scan tool and smoke machine. Typically a loose gas cap can cause this code. if the gas is loose or left off it will trip a gross leak code. Otherwise a sticking open evaporative emissions vent valve on the charcoal cannister or damage to one the evap system lines or leak at the fuel tank could be the cause. Thats where a smoke machine comes into play by pushing smoke into the system, using a scan tool to close the vent and see if any smoke leaks out. If you see no damage you can try a new gas cap. Otherwise a shop will need to test this system.

Expert:  HDGENE replied 3 months ago.

Do you need more help with this concern?