A P0420 code is "Catalyst System Efficiency Below Threshold (bank 1).
This would indicate that the cat is not getting quite hot enough, or is simply worn out, and is no longer performing its job.
Bank one is considered the side of the engine with the #1 spark plug, which is the cylinder farthest forward.
look it up on yahoo as engine codes cylinder 2 misfire it happened on mine the other day. 98 2.7 litre 4x4
It's Catalyst system efficiency below threshold
Code PO420 is catalytic converter efficiency low bank 1
yes you can also they are warranted for 8 years or 80k miles whichever comes first
Trouble code P0302 means:Cylinder 2 misfire detected
Trouble code P0505 means: Idle Air Control System
Trouble code P1135 means: Air-Fuel Sensor Heater Circuit Response Malfunction
catalyst system fault
Trouble code P0171 means: Fuel System Too Lean - Bank 1
Repair the problem that turned it on and then clear the code with an OBD2 scanner/code reader
Trouble code P0420 means: Catalyst System Efficiency Below Threshold (Bank 1)
01 toyota salara oxygen sensor how to replace it code p1135 p1155