Honda Ridgeline 2008 P0420 Code after extremely cold weather
I have a 2008 Honda Ridgeline, well maintained by a trusted dealership. I've had the truck since 2010 and it now has 260K KM (162K Miles). Last week we had several days of extremely cold weather -24C (-11F). (Western Canada) While driving the check engine light came on. I checked the ODB system and found that the P0420 code was the only error being reported. This stayed on for several days with no additional codes.
I tried to reset the error the first day but the check engine light stayed on. On the weekend the check engine light has gone out but when I read the ODB system the P0420 code is still showing as present.
Last year I had an O2 sensor error on Bank 1 and replaced the sensor.
I've been researching this emission problem but don't know if this is a sensor problem caused by the sudden cold weather or if there is a problem with the catalytic converter system. The truck drives fine. Accelerates normal with no perceived loss of power.
Any advice on how to test the sensors to determine if they are a problem? Is this something that is known to happen with sudden extreme cold?
If I need to replace the catalytic converters, are aftermarket reliable? There are 3 on this truck. The OEM are almost 3 times the price of the aftermarket here in Canada. I typically have used OEM for maintaining this truck. Reliability has been great with minimum costs beyond the scheduled maintenance. I just had the timing belt and water pump replaced as part of scheduled preventative maintenance. I still love this truck...
PS Though many people here scoff that its not a real truck. Its great in the snow and I can do most of my urban truck duties like pickup lumber and dirt (on the few times a year its needed), it can tow my family camping trailer, it is a pleasure to drive on the highways and it fits in my garage.
Thanks for your advice,