Fault code on my Allroad 2.7

[Morne]

Hi guys i know i dont have a S4 but i have a few fault codes on my car and not sure what it means it is a 2000 Allroad 2.7t auto same engine i think as the S4 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
Morne,Today at 2:39 PM

 

[aragorn]

1 and 2 means your SAI system is broken or removed. Not really a big deal.

3 probably means your coolant sensor is faulty.

 

[Morne]

What is a SAI so non will make the car run bad as on my S4 used to get 23mpg but on this im getting just over 18mpg i know its a heavier car

 

[aragorn]

SAI is secondary air injection.

Its a pump thing which blows air into the exhaust manifolds on warm up to improve emissions while the engine is cold.

Quite often the pump fails and gets removed.

 

[jbh]

if the coolant sensor if faulty this will affect you're mpg

 

[aragorn]

Its also an auto, which are generally less efficient than a manual car and will use more fuel.

 

[jbh]

Its also an auto, which are generally less efficient than a manual car and will use more fuel.

very true

 

[Morne]

Ok so where is this sensor located and is it something i can do or does have to be done by a garage thanks