Re: Check engine light
Well I suspect you can just download the '05 service manual from here somewhere and review page 9-426 et subs that contains:
"(P0410) SECONDARY AIR INJECTION SYSTEM (CONTINUED)
When Monitored and Set Condition
² When Monitored: Once per driving cycle with the engine at idle, air conditioning is off, barometric pressure is
greater than 78 kPa (11 psi), engine coolant temperature is greater than 50°C (122°F) and no other DTC set.
² Set Condition: When the test is enabled, the O2 Sensor must increase by at least 23% (rich)."
And then provides a list of possible causes and a diagnostic method.