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My 1981 Toyota Corolla won't pass the smog test

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A Vehicle This Old Must have Very High Millage, And it is Possible that there is NORMAL wear that has taken place that Unfortunatly ONLY a NEW or Newer Engine Will solve this Problem. IF ALL OTHER OPTIONS IN REPAIR HAVE BEEN EXHAUSTED--Such as Major tune up Valve adjustment - Emision system inspected and CLEARED of Defects , The Only FIX is A New Engine. As Part of my Job for some 25 + years I Have had to be the Bearer of BAD NEWS such as this, Good Luck 1981 toy Cor Millage is????

Posted on Jan 13, 2009

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Need to pass smog test. Trouble light is on.


The code is for vent valve circuit. the vent valve is part of the evap. canister and is sold in one unit.Before you spend to much money on evap canister let mechanic inspect the valve and confirm the problem
Good Luck

Mar 23, 2014 | 1998 Toyota Corolla

1 Answer

Service engine light on-won't pass smog test


You will need to plug in a OBD reader first and run a diagnostic check. Without this we can only guess at what may or may not be wrong with it.

Nov 03, 2012 | Cars & Trucks

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My 1991 Toyota previa doesn't pass the smog check


There are many reasons why the engine and the emission systems fails a smog check. If you go to this page it will give you ideas on how to pass the test next time around.

Feb 13, 2012 | 1991 Toyota Previa

1 Answer

My car won't pass smog because the engine light won't go off. Is that possible? What does the engine have to do with smog? It's a 2002 Corolla


Smog is what comes out of the tail pipe. Have the engine checked out as to why the light is on, and have it fixed. .

Nov 22, 2010 | Toyota Corolla Cars & Trucks

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Dont pass smog test need to know what parts to replace


We need a lot more information. What does the report say failed the test? Is there a check engine/service engine soon light on? If so, what is the trouble code?

Feb 22, 2010 | 1992 Toyota Corolla

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Having a problem passing a smog test on 1996 Toyota 4Runner SR5 V


NOX is produced when cylinder temperatures exceed 2500 deg. The systems in place to reduce NOX are EGR and the catalytic converter.
If the number is only slightly higher than avg then I would suggest the EGR, make sure that any vacuum lines are attached and that the diaphragm moves freely, be sure not to damage the rubber inside the EGR.
Retake smog test, if numbers still out of range replace the cat.

Jan 12, 2010 | 1996 Toyota 4Runner

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Hi, my car today failed in smock check,the emissions test fail, and I don't know how to read de results, can you help me to read and fixed the problem?


Go to AutoZone or Kragen and get a $9.00 bottle of PASS ANY SMOG TEST or double
your money back (keep your receipt). You just pour it into your gas tank at a FILL UP and run
that gas down then refill your tank and take your Smog Test. It will pass. What state are you in??
What are your smog test numbers??
MikNas in California

Aug 14, 2008 | 1989 Toyota Corolla 2 Door

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