Car is '97 E320. Three times in recent weeks CEL has popped on. When I pull codes, I get P0133 (O2 sensor slow response) and P0341 (crankshaft position sensor). I clear the codes and they come back as a pair a few days later. Car runs fine but seems to be a little slow on starting sometimes. Does anybody know how these codes can be related? My inclination is to replace the O2 sensor first.