Persistant codes p0420 and p0430 Honda odyssey p0420: bank 1 location & dtc code explained P0420 catalyst system efficiency below threshold (bank 1)
Honda Odyssey P0420: Bank 1 Location & DTC Code Explained
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Honda Odyssey P0420: Bank 1 Location & DTC Code Explained
Persistant codes P0420 and P0430 - Honda Ridgeline Owners Club Forums
P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) - In
P0420 Catalyst System Efficiency Below Threshold (Bank 1) | The Motor Guy