Question about 1997 Toyota Corolla

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Failed emission test 1997 toyota corolla hc and co very high hc 235 co3.59

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Running too rich, probable causes spark plugs, pcv valve malfunction, leaking injectors, vacuum leak, catalytic convertor, o2 sensor,

Posted on May 12, 2010

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I failed Emissions Test: 15mph: HC - (max 66) 150


go to autozone and have them look and the check engine light and that will help you figure it out. they should also give you a piece of paper that will tell you what is wrong take that to an auto mechanic and ask his opinion

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C15001993 truck 4.3 v6 Failed Emissions HIGH CO again


Sounds like you lost O2 Control

Check fuel trim & data with professional
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I failed emissions test. The HC and CO both failed. I was told by a family member that it sounds like the catalytic converter and I wanted to know how much that would cost or estimated cost to replace


Rich fuel mixture is leaking fuel injectors,failed oxygen sensors

Need clean air filter,new spark plugs

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This is a social web site we use as you do so prices are are over the internet less labor of coarse

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Golf 1.4 2003 very high emissions


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1989 Toyota 22re fails California Emissions Test. Rebuilt the engine 20K or so miles ago. Has passed most tests with just a little bit of timing adjustments. At 15 MPH, (1670 RPM) HC measures 153...


HC is hydrocarbons or unburnt fuel.(raw fuel ).NO no such gas measurement.did you mean CO this is carbon monoxide or incomplete combustion.(all the fuel is not being burnt).if you mean NOX this is nitrates of oxide and is related to a heat problem.(motor running hot,bad catalytic converter).its probably getting too much fuel and not burning it all,possibly tune-up problem,carburetor(if it has one),bad fuel injection system(dirty injectors),computer(if it has one)may be getting a wrong signal.these are in reference of high HC and CO.for high NOX cooling system not keeping motor cool enough,cooling fan problem(weather clutch fan or electrically controlled cooling fan),poor cooling system circulation,bad catalytic converter.not a running lean problem as the other gases indicate rich problem.the converter may not be able to convert the emission gases to H2O and CO2 out the tailpipe.

Apr 24, 2011 | 1989 Toyota Pickup SR5

1 Answer

My 1991 4runner failed emissions test with high CO and HC levels.


Not sure, but did you replace the oxygen sensors. Is your catalytic converter still good?

Aug 21, 2009 | 1991 Toyota 4Runner

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Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

1 Answer

1991 Honda Accord LX failed emission test on smog test. High CO and HC on 25mph


not enough info. Typically, CO and HC together can be the result of poor fuel control or misfire, or worn components such as O2 sensor or catalytic converter, but without more data, repair recommendations are likely to waste money and not achieve success.

Mar 07, 2009 | 1991 Honda Accord

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