300E Bad Cat Converter ?

Hi
I just had my emissions / smog check here in California and the NOx were really high. Very close to failing.
I suspect a bad cat. I measure the temp of the cat with a fluke infrared
and measured 245C or 473F. The temperature was the same at the front, middle and back of the cat. The car was running at operating temp, I did this after I came home from work and the water temp was near 100C
Shouldn't the reading be closer to 426C or 800F?
Ideas? It looks like the original cat , the car has 175,000 miles
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You got your monies worth out of that cat. You need a new one.
Do NOT just weld in a tiny POS cheapo cat. Get a real one WITH the pre-cat. Like this one: http://www.car-stuff.com/carparts/mercedesbenz300e19861989decmb2212c264172.html

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thanks for the reply, at first I thought you meant buy a new car. :')
I live in California but the car is from the east coast, so I should NOT get the California CAT?
how about the catco for $255?
http://www.autopartswarehouse.com/details/QQMercedes_BenzQQ300EQQCatcoQQCatalytic_ConverterQQ19861992QQ9717.html

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Why do I not see a cat in that exhaust?? Why does that so-called cat not look like any USA exhaust??
Open your hood and look down where the exhaust bolts to the exhaust manifold. Do you see pre-cats there?
Go here and look at the lower exhaust in the picture. That is what you should have. http://www.detali.ru/cat/oem_mb2.asp?TP=1&F 4030%5F501&M3983%5F505&GAr2%2E320&GMq7%2E430&VIN=%2A&CT=F&catP1&SIDI&SGR0&SGN

were
infrared
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Not so fast mit der schpending off der big bucks Check the EGR valve, either clean or replace, also vacuum lines Peter

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You would be surprised at how little a EGR valve lowers NoX. EGR lowers combustion temps to stop the formation of NoX. NoX forms when combustion temps exceed 2500 F.
The cat controls about 95% of NoX.

infrared
did
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