2005 Town and Country 3.8 (94,200) - P0420 Code



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Thread: 2005 Town and Country 3.8 (94,200) - P0420 Code

  1. #1
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    2005 Town and Country 3.8 (94,200) - P0420 Code

    I got the P0420 code last night...Should I start by replacing the downstream O2 sensor, the upstream was replaced recently. The downstream sensor is original, cat is original? Can i damage the car by driving it until I get this fixed?

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    First try resetting the code and see if it comes back. Disconnect the negative battery cable for 2-3 minutes or reset it using a scanner. If it comes back and you want to swap parts, the aft O2 sensor is one candidate: http://www.obd-codes.com/p0420

    Your van should be ok till this is fixed but don't wait six months. If the SES light starts flashing, don't drive it anywhere except to get it fixed. It means the catalytic converter is potentially overheating and may need to be replaced if you keep driving.
    Last edited by RIP; 03-20-2011 at 12:17 PM.
    ******** We took the time to answer your post. Please give us some time and post the fix. You'll help hundreds. ********

    **** Follow all prescribed safety procedures before attempting any repairs. If in doubt, refer to a maintenance manual. ****

    96 Gr Caravan LE 3.8, 208K miles
    07 Fusion / 06 RAV 4 / 06 Accord / 94 Camry

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    I'm going to replace the downstream sensor and see what happens....Is it difficult to replace the cat on the 2005 (3.8) ?

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    Not difficult if you have any experience with exhaust work. The most challenging part is removing the 4 bolts where it attaches to the exhaust manifold on the back of the engine. They're very difficult to access and most likely very corroded. I wound up cutting or breaking them all off to remove.

    2011 Grand Caravan, 3.6, 120k miles
    2000 Neon ES 2.0, 140k
    2006 Pt Cruiser 2.4, 110k
    Past Caravans:
    2005 Grand Caravan SXT, 3.8 247k miles, Sold
    2002 Grand Caravan SE, 3.3, 166k miles, Sold

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