Question about 2005 Dodge Magnum

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I am getting a P0430 and a P0420 code on my 05 Dodge Magnum with a 2.7 engine. I have changed both cat. conveters and both 02 sensors after the cats and I am still getting the check engine light. What is my next step?

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  • yadayada
    yadayada May 11, 2010

    did u use factory cats? if not that is the problem

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There are two more sensors and i would use chrysler sensors

Posted on Jul 21, 2009

  • Linda LeBreton
    Linda LeBreton Mar 25, 2014

    HOW MUCH DO YOU THINK IT WOULD COST TO CHECK AND TO FIX

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Those cars are notorious for engine problems unfortunately. The exhaust valves tend to warp from heat after around 200k miles. Therefore throwing the O2 codes. Best outcome and cost effective thing I can recommend is replacing the engine with a new or low mileage engine.

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code p0733 refers to gear 3 -incorrect ration===causes---wiring---TR sensor/switch--shift solenoids---transmission mechanical fault
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basically replace the cat converters as they are blocking the exhaust system and preventing your over 45mph problem
replace the TR sensor/ switch as you have not mentioned a transmission problem
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2003 impala. Hard starts and fumes smell.


this is what i found for you

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensorwaveform reading should fluctuate. The downstream O2 sensoricon1.png reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

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ok lets do this in order
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P0420 and P0430


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