Codes? P0412, 0418, 0135?
P0412- Secondary Air injector valve
P0412- Secondary Air injector system valve A malfunction
P0418- Secondary Air injector Relay
P0418- Secondary Air injector system relay A malfunction
P0135- O2 sensor heater circuit malfunction B1 S1
Could this be caused by a bad o2 sim plug? I removed the necessary relay for the AIR system should I have left it in?
2002 Z28 6-speed
best Regards,
Adrian

