Question about Chrysler Town & Country

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I just replacecoolant temp senor on a 2002 town and courty and both o2 sensor and hac the calst cov replace 2 time in the last past year why i still get p0420 code

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P0420 is a code that suggests that the catalytic converter has gone bad. I couldn't tell by your post if you have replaced that or not but if you did and you used an aftermarket catalytic converter (one other than the dealer part) than that can be your problem. Aftermarket cats are not all the same or as good as the O.E. cats. Especially the universal fit type converters.

Posted on Oct 15, 2010

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  • passion5905 Oct 16, 2010

    Yes I did replaced my converter 2 times in the past 18 mons as well as my 02 sensors which I replaced in ythe past week and today I replaced the coolant temp sensor but did reset the engine yet hope it turn off by it self now I will reset it in the morn . Just wonder what else can it be I even replace my rad last month the engine keep turn back on with the code p0420 I know unv converter can go bad but come on now not 2 times in a short time . Maybe the coolant sensor fix it but I don't know till I reset the cpu .and it it norm to smell anitfz after you replace the coolant temp sensor I know that when I remover it some fluid come out which I think it anitfz so it can be that it burning off the lil that come out on of it .....please help

  • Jeremy W.
    Jeremy W. Oct 16, 2010

    It doesn't have anything to do with the collant temp sensor. I would bet that the universl converters are the problem. I can tell you from experience they don't work/last like the O.E. or better direct fit converters.

    If you installed them yourself you need to make sure there is no exhaust leaking near the rear O2 sensor. This can through the sensor off and cause it to flag false codes.

    The last thing you could possible do is look at live data. There are some relatively inexpensive scan tools that will let you do this. Rear O2 voltage should be relatively low wiht a warm engine at idle. You can also check this with a voltmeter by back probing the signal wire from the rear O2. If its not reading low or switching between high and low voltage the converter is not doing its job.



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