P0410

The P0410 code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.

About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.

A code P0410 may mean that one or more of the following has happened:

Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
Blown AIR pump fuse due to freezing up

It may not cost you anything, you may be able to fix yourself. The code is simple, monitor oxygen sensors when air pump is cycled on and/or off. If predetermined changes aren't observed, a failure must be present. If the air pump works, you know you have the basis for a functioning system, one thing to consider is a California car may have dual air pumps and possibly one is not operating. The other pump is located under the right front corner of the vehicle. Another common fault is the vacuum line at the solenoid, it is mounted to the bracket that also supports the rear bank AIR valve, and has a brown electrical connector(make sure it's connected also). Check that there is source vacuum getting to the solenoid from the line that connects at the throttle housing. More than likely, you will find your fault at this solenoid, the vacuum line comes off easily. Since it sets a 410, it is a problem seen on both banks, not just one, so I would not suspect an AIR switching valve because both would have to fail same state. In regards to that mention of the Cali cars having dual pumps, I would not suspect a failure affecting both banks either, just an FYI.