Question about 1991 Honda Prelude

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White smoke from exhaust and smell gas fumes

Mcgyver465 or anyone,
My car is showing code 41 which is "heater switch" to the Oxygen sensor.
If this switch was bad would it cause these symtpoms? . .
Somebody keeps telling me that I need a new catalytic converter or
test pipe.If there was a problem w/ the CConv , would that show up
as a seperate code on my computer?

Posted by on

  • cmtlady222 May 10, 2009

    Sorry I confused you and myself with the question.
    My car was showing a code 41 which is the heater switch
    to the O2 sensor .. .well, i had someone just put one in (02 sensor)
    so when I had it hooked up to a scanner that showed 02 problem,
    i said "can't be, I just replaced that' , they said you could have
    gotten a bad once or the wiring to the 02 might be bad,
    so told the guy that works on my car this and he replace
    the 02 sensor a 2nd time. . .(((( .problem i still have is
    my car is blowing white smoke from the exhaust and I smell
    very strong gas/exhaust fumes in my car))))). What could be
    causing this? IT's not the catalytic converter either becuae
    he used a big pipe and cleaned it out. hope this clairifies the original question.

    Originally posted . . . .
    My car is showing code 41 which is "heater switch" to the Oxygen sensor.
    If this switch was bad would it cause these symtpoms? . .
    Somebody keeps telling me that I need a new catalytic converter or
    test pipe.If there was a problem w/ the CConv , would that show up
    as a seperate code on my computer?

  • Mike Butler
    Mike Butler May 11, 2010

    Are yo getting white smoke from exhaust & smell of fuel as heading states?



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A plugged catalytic converter can set codes, but I think we need to concentrate on smoke right now. That's not saying that the converter wasn't a partial, or the cause of the white smoke. Has your oil level or coolant level been going down, or up recently, since this all started ?
You say he cleaned all the insides of the catalytic converter out, so there is no blockage there now, correct? Did you erase the code when you replaced the oxygen sensor, and it came back again? Finally, if you have white smoke rolling out your exhaust, it is usually caused by oil or coolant consumption getting into the cylinder, which could also be causing oxygen sensor to foul up & cause a code. I'd concentrate on finding the cause of the white smoke first. Cooling system pressure test, engine compression check should tell you , but so should consumption of oil or coolant increase. If the problem originated at the converter (plugged) it may have caused a blown head gasket for one thing. I'll wait for your reply.

Posted on May 10, 2009


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