P0410, P1410 and P1411

[jtucker]

'99 Boxster w/ 41 k on the clock. I have recently been getting these codes on the CEL. Always P0410, and sometimes in combination with P1410 OR P1411, never both. I have just had the car serviced (< 300 mi.) and it runs fine, so I am thinking not MAF). Sometimes I can go 100 + mi, sometimes the CEL lgos off just a few miles after reset. Last time I "thought" maybe the air pump was not running but I am not positive. Any advice?

Thanks,

J. Tucker
'99 Arctic Silver
'98 318ti