My SES light has been on for a few weeks. I borrowed a OBD/II reader
from AutoZone, and read the following codes:

P0133 - 02 Sensor CKT flow response (Bank 1 Sensor 1)

P0341 - Camshaft position sensor A Bank 1 CKT Range/Perf

P0133 - pd - same text as first, but with pending.

This is a 97 SL2 with about 162,000 highway miles.

How serious is the camshaft position sensor?

Thanks,
Jim