What do I replace with a p0420 code on my 2000 Lincoln LSv8. I tried the upstream o2 sensor on the driver's side cat but check engine light came back eventually. Should I also replace the downstream o2 sensor on the driver's side? Bad Plug?
by 
gman1449
ANSWERS: 3
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P0420 code is typically a catalitic converter. You can take your vehicle to and exh. shop and they can take a look and see if you need a new cat.
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zombiet is coorect ..For all you here is a nice link to help you out in future code issue or questions...it's the best one i have seen http://www.aboutautomobile.com/dtc or http://www.obd-codes.com/
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Catalyst Efficiency Monitor and Exhaust Systems: P0420-Is an exhaust issue....could be cats, could be O2 sensors (downstream). NOTE This Pinpoint Test is intended to diagnose the following:P0420 Exhaust system pipes (front and rear) Exhaust system muffler and tailpipe assembly Catalytic converter Exhaust manifold Harness circuits: Downstream Heated Oxygen Sensors (HO2S) I would try replacing the downstreams. Hope this helps!
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