Few fault codes

Morne

Registered User
Hi guys i have a few fault codes on my car and not sure what it means it is a 2000 Allroad 2.7t auto and codes are as follow

1. 17831 secondary air injector system bank 1 insufficent flow(P1423) inter mittend
2. 17819 secondary air injector system bank 2 insufficent flow(P1411) inter mittend
3. 16902 coolant temperture sensor (662) signal to hugh (p0118)

Is any of this seriuoes and what needs doing to fix it

Thanks
 
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