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cat converter failure

 
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Old 10-03-2012, 10:36 PM
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cat converter failure

so I am looking for a car for my girlfriend and we found a really good deal on one that she likes, but the cat failed twice.

i researched what would cause these problems, and found these:

sparkplugs or wires bad
needs to be tuned
bad o2 sensor
----
those im not worried about

the one i found that im worried about is

oil or antifreeze entering exhaust...

im gonna research more on this problem, but is there anything i can look for when we look at the car to tell what problem it is?

like taking the cat off and rubbing my finger in the exhaust piping to see if there is oil residue or something??

the only CEL code that he said there was, is the cat failure code on a VW Cabrio...

its going for $1200 NEG, so probably $1000, so if i can tell from going to look at it, that its just o2 sensor, or spark plug problem that can be fixed for $100 give or take, then we will buy it...

but if its more than that then i dont wanna buy it...

he said he took it to a mechanic and they replaced the cat, but then it happened again after a period of time...
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Old 10-04-2012, 07:25 PM
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Re: cat converter failure

If it's oil black smoke, if coolant white.
Also smell some of the exhaust coming from the tailpipe. If it smells very strong/bad(gassy) or stinky it's the cat which proly is more leaning to o2 sensors. if it smells sweet-ish it's burning coolant which will cause the cat to fail due to chemical reaction a cat isnt spose to make with antifreeze. Water should also be present but not too much. water and co2 is a natural reaction from all that exhaust business.
IT is better that oil burns then coolant IMO. coolant always involves replacing the head gasket. This is from what i randomly read and talk about
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Old 10-04-2012, 09:31 PM
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Re: cat converter failure

thanks for the response, i looked into it and found the exhause smoke colors and explanations, but the guy was acting shady about it, so we arent even gonna bother, we found another car in better condition. going to look at it tomm.

mods if you want, close this thread, questions answered.
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