Question about 1992 Toyota Previa

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Toyota previa fail emission test high hc and co

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4 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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fastboyz
  • 674 Answers

SOURCE: ASM 2525 NO ppm TAILPIPE EMISSIONS failure

have you had the the engine codes pulled and reset?
and if so what are your engine codes?
i dont know of any car that will pass emissions test with the engine light on.
we cure your trouble that caused your engine light to come on and you will pass your test.
later
paul

Posted on Nov 24, 2008

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  • 65 Answers

SOURCE: 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?

Posted on Aug 21, 2009

  • 2309 Answers

SOURCE: failed emission test 1997 toyota corolla hc and co

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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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.

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

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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?

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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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