Having problems with your Chrysler Concorde ?

Code P0420 I have a 01 honda accord ex 2.3 liter v tech engine wich has california emissions. My check engine light is on. it had failed inspection so i did a complete tune-up , oil change, air filter,. I replaced the knock sensor because there was a code for it and it was actually broken. and i also changed the egr sensor because there was a code for that and it was clogged. my check engine light went off and when i got to the inspection station it came back on on and now i am showing P0420. ca

Posted / edited by AnonymousUser on : 25-05-2020

Answers :

P0420 Catalyst System Efficiency Below Threshold (Bank 1)
\015\012There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
\015\012Possible Causes:
\015\012Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
Repair Help & Product Troubleshooting for Chrysler Concorde

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