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.

I would start with the cam sensor.

It's only job is to synchronize the injectors to camshaft position, very crutial to starting the engine.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

How tricky is it to get the clearance on the sensor correct and how do I do it?

About 99% of the time it is bolt on & go...........

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I'll have at it.

was an easy job acomplished with a 3/16 hex wrench. Really needed a 5mm but couldn't find my metric set. Car seems to start more readily. Cleared the diagnostic codes so we shall see what happens now.