I have a 2000 SSEi w/52,000.
I just had my O2s (B1,1 &B1,2) replaced but the codes still come on.
Car seems to be running great at low end but I have felt a skip occasionally and I do seem to have trouble getting to redline under acceleration. It doesn't break down or shudder it just won't get there quickly. Boost gage pegs though.
Any ideas?

If you don't know the code definitions, check them in techinfo and post them here in the thread, along with the code, so everyone doesn't have to go look them up. Any mods done to the engine? Pegging the boost gauge at stock is pretty unusual.

Did you use Bosch oxygen sensors? If so our cars hate them, get them from the dealer.
Check your wiring to the O2 sensor, make sure the harness did not come loose and make contact with the exhaust pipe.
131 and 137 both show low voltage.
171 fuel bank lean is a condition of the O2 sensors not working.

Like PDad said, check those O2 wires for any damage and while you are at it, make sure that they don't touch (or aren't too near) any spark plug wires. The interference can send bad signals.

Thanks for the help everyone.
Codes cleared themselves yesterday but I expect they will re-appear soon.
It seems continued hard acceleration prevents a slight skip which appears to precipitate the codes.
Any ideas on what'* causing the skip?

Can you tell us a few more details please.
When was you last tune up?
Did it include plugs and wires?
You mention O2 sensors being replaced was there anything else?

It hasn't been tuned. My mechanic says plugs and wires are fine.
Can you suggest wires and plugs? Should I go with Iridium?

A tune up is good starting point, at 52,000 miles the plugs and wires are likely worn if the O2 was and are not that expensive. You should also consider the fuel filter, pcv, air filter and oil change.

Describe the skip a bit better if you can, what conditions, rpm driving style etc.

The skip is very infrequent, under low acceleration or mild hill climbing.
I've replaced the fuel and air filters and do a LOF every 3k or 4 mos.

When ever I've experienced the condition you describe in my car its come down to ignition.
Either plugs, wires, coils.
Make sure the plug wires are not touching anything, usual hot spots are trans dip stick, O2 sensor shroud, oil dip stick, alternator bracket in some cases.
Check the resistance of the coils and plug wires, there is a write up in techinfo.