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Wondering why my 2007 Dodge Dakota with 4.7 liter V8 needs new catalytic converter(s) as truck
only has 49000 miles on it? Bought it used a year ago and everything was fine until about one month ago.
Supposedly Dodge does not even make catalytic converters for this older Dakota anymore and will have
to go with a higher quality after-market one. Need it to pass emission test in Illinois and plan on keeping
truck for quite some time.

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The condition of catalytic converters does not depend so much on age or miles as (1) whether any impurities, such as coolant or excessive oil, have run through it (damaging or plugging the catalysts), or (2) whether the engine had problems that caused excessively lean or rich conditions or misfires (excessive heat that fused internal passages) for extended periods. A converter can last a very long time if the engine is properly maintained, is repaired promptly if something goes wrong, and if harmful additives are not run through the air/fuel paths in the engine. For this reason, make sure the engine is running properly before replacing the converter, or the new converter may suffer the same type of damage.

See this link: What Damages a Catalytic Converter? | Hollenshade's Auto Repair
 
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