Question about 2004 Audi S4

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Bad catalyc converter! audi s4 b6

I would like to know,if a cloged catalyc converter with the charcoal from inside the broken its all loose inside very bad,will make the car misfire only cylinder number one!!or if will make the car misfire at all? cuz audi said that they have to replace the engine because the wall where the pistons goes is scrathed,but all the valve,pistons,rings are in very good conditions i think the mechanis missjudge my car,without cheking the cat first.any idea?

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Sounds like **** to me. Did they do a compression test to determine this? Cat Converter can't cause a misfire on one cylinder. It is more likely a plug, coil, or fuel injector. Get a second opinion!

Posted on Feb 27, 2009


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Can a diagnostic detect a bad catalyc converter?

Depends. A five gas analyser can tell the amount of NOX, CO, CO2 which will let you know based on what the values are. You can do a visual test at night if the car is running. Just look underneath. If it is glowing hot it is plugged. If you smell rotten eggs coming from the exhaust it is a good sign its bad. You can beat on it with your hand and if you hear debri inside being moved by the beating it needs replaced. A dianostic like a cheap scanner will tell you your downstream O2 sensor or bank 1 sensor 2 or bank 2 sensor 2 has a fault code but that isn't exactly going to tell you the Cat is bad. If your scanner has the ability to give you data you can see if the value is high or low depending on what the vehicle is supposed to read. If your upstream sensor 1 is reading good and your down stream sensor is reading bad there is most likely a hole between them. The sure sign of a bad Cat is lose of power, the smell of rotten eggs, its glowing under the car from heat caused by blockage, your O2 sensors are acting up or throwing codes, you can hear a leak coming from it or see one. Some Cats don't stink when they go bad because of the type of catalyst used inside. So if you know what your doing you can use a dianostic test to detect a bad catalytic converter.

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I need help to confirm location of sensor 2 bank 2. CEL detect P0161. There are 4 sensors in which two are above the catalyc converter and two are below the converter. The part department staff says the...

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the cause is the exhaust system and the two-way catalystic converter system of your S4.

The converters become very hot if you put the hammer down (app. 500 deg. celsius on the outside) and even though there are heatshields mounted between the converters and the vehicle´s floor, you can feel the heat inside.

The transmission itself is producing high temperatures as well, so no worries, remember your S4 is sport´s car ;)

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Check engine light (CEL) problem

Yes the CEL should have turned on. Just turn the key to the run position and the light should turn on.If it doesn't, the bulb may be burned out. Also, if the coil failed and was driven for awhile, it may cause the cat converter to fail after awhile of driving. So, please keep that in mind.

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2004 audi s4 b6

Very weird, a bad cat should not make it mis-fire, if it is just one cylinder it is mis-firing on, its worth checking the coil pack for that cylinder

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