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Old 04-14-2019, 04:52 PM
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Default PO420 & Catalytic Converter question

I'm getting a PO420 code from my OBD. I have a Flowmaster exhaust, but the catalytic converters are OE on my 2005 Dodge Ram 1500 5.7. I'm probably going to replace both sides with Flowmaster catalytic converters (along with new bolts, etc.), but I'm unsure if I need to get an exhaust pipe flange gasket (donut) to mate the new pipe with the old exhaust manifold. I'm pretty sure I do, just never done that before. Any advice? Any recommendations on Walker versus Felpro, etc.?
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Old 04-14-2019, 05:16 PM
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Have you used a infrared temperature gun to check the O2 sensors ?
The output should be about 100 degrees Fahrenheit hotter when the engine is fully warmed up.

Read more at: https://www.obd-codes.com/p0420
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Old 04-14-2019, 05:43 PM
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Thanks, GT - I'll check it out. Thanks for the link too. I'm picking up a IR Temp Gun today and will post my results later, probably next week.

Last edited by Lorisfarmer; 04-15-2019 at 06:49 AM.
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