Question about 2004 Mazda 6

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CEL P0431 but passed smog emissions in CA - how can I pass emissions if the CAT is damaged? Could it be another issue?

What would be the best way to check other emission related issues to get a pass on my functional and visual for smog?

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Maybe not your answer, but it is related: Before going to have your car smogged, check your gas cap. Check the condition of the gasket, or o-ring, inside the gas cap. If is already drying out, full of cracks, get a new one. It will not pass the visual inspection. The smog technician, salesman, will try to sell you a new one for $15 when you could get it for $8 at your local auto-parts store. The technician will tell you that if you do not get it right there and then, he will have to fail your car on the visual test and you will have to comeback to have your car re-smogged again.
The cap might still be doing an OK job of sealing the tank, but it won't pass the Visual, especially if the tech wants to sell you a cap. You can tell if the cap is doing its job if you hear a hissing sound whenever you open the gas cap after running the engine fro a while. If it is not providing a good seal, then you might get a check engine light with a code about a failure in the evaporative system.
Just a little thing to check before you go and put yourself at the mercy of the smog tech.
For $15 you could get a locking gas cap, which might be a necessity now with gasoline prices being what they are, now.

Posted on Nov 01, 2012

  • Renae Nov 01, 2012

    Thanks for the tip...we will do that.

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YES!!, you had it tuned, it runs good, but gas mileage dropped, and check engine light is on,it sounds like the o2 sensors are slow or even dead, i would replace them for sure and that just might solve all your problems,good luck, hope this helps.

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