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Re: P0456 code at 2/3 tank keeps triggering check engine Posted by SWEDECAR [Email] ![]() ![]() ![]() In Reply to: P0456 code at 2/3 tank keeps triggering check engine, Paul H, Sun, 8 Jan 2012 14:05:31 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Since your car is newer with yet even more strict EVAP leak tolerances, it is not enough with just 0455 large leak and 0442 small leaks but they now have to have codes like 0456 for VERY MINOR leaks.
It's getting pretty ridiculous.
It will take a very interested shop to find leaks of that size and a customer ready to spend some money to fault trace it. Smoke machine is a must of course. And so is the Tech 2 so that you can run a simulated test right away after you have done some alterations.
Make sure the gas cap has enough resistance so it doesn't open its valve too early.
It is many gas caps out there that lets go too early during the vacuum test.
Anders
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