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Randall C
Randall C, ASE Certified Technician
Category: Car
Satisfied Customers: 12803
Experience:  32 years Foreign / Domestic Cars All aspects of Diag and Repair
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scion xb: I have a 2005 scion xb and it has a code p0442. What

Customer Question

I have a 2005 scion xb and it has a code p0442. What are the probable causes
Submitted: 3 years ago.
Category: Car
Expert:  Randall C replied 3 years ago.

Hello, I am Randall. I have reviewed your question and working on it now.
Code 442 indicates a small evaporative leak
It is emissions code only
The fusle tank and vapor system are pressurized per say, then the computer can detect if a drop in that pressure should a leak develop
It is a very difficult to track
In the shop a smoke machine is used to inject a smoke into the system and look for smoke leaks
If no work has been done recently, no vacuum hoses or emission control items disturbed?
The most common for the code is a bad gas cap
In the shop that is the very first thing we replace for the code
A not sealing gas cap is the leading cause of the code

Below is a list of possibles. I realize a long list thus the smoke test and full inspection