Secondary air injection and 17550, 17560, auto, 2.0l

Hi, We have a 2001 Jetta, automatic, 2.0l, 98,000 miles. Using Vag Com we get codes of:

17560 - Long Term Fuel Trim Additive Air; Bank 1; Range 2: System too Lean P1152 - 35-10 - - - Intermittent 17550 - Load Calculation Cross Check: Lower Limit Exceeded P1142 - 35-00 - -

and the readiness code for the Secondary Air Injection is "failed or incomplete".

Any idea what this means?

Any help is appreciated.

Thanks