When it gets warm, 90 on the temp gauge, it sometimes developes a missfire which can last for 5-80 seconds, totally at random but sometimes drives fine. I had it plugged in and got a few codes, P1336, P0202, P0341 and P0410. The ones that are giving me grief are P0410 secondary/auxilary air pump, or as the display said "Air injection at exhaust malfunction". Where is it located? I think it's just above the alternator at the front of the engine, but not sure, can anyone help? P0202 injector open circuit, does that mean either new injector needed and/or wiring? It's a 2004 2 litre petrol.