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Originally Posted by George G.
I got another code last week. Took it to Autozone and came up with P0442 Evap Emission System Leak (small). So the guy looks up a A/C evaporator core and says they don't carry it...is it me or was he a little  I'm thinking possibly vapor canister in the fuel system..if the Rodeo is equipped with one. Can someone shed some information? I searched but no info came up on the code.
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You got a real winner at AutoZone.

I'm surprised he didn't try to sell you an O2 sensor. Next time you get a CEL, get the code read and go
here. You can get troule code info at AllData.com if you have a DIY account.
An easy thing to try is to tighten your gas cap. A loose gas cap (could also be caused by the vapor canister or fuel tank pressure sensor) is the usual cause of the Evap Leak code.