1999 e300 dpf (Diesel Particulate Filter) or trap oxidizer.
 

I recently bought this car and found out the DPF or Trap Oxidizer was removed. I pretty much ok with that because I live in an area where smog checks aren't necessary.
But I believe there should be O2 sensors and there isn't any. Could someone point me in the right direction as to where the O2 sensors are hooked up to wiring harness. I'm going to install O2 sensor bungs and O2 sensors but would like a heads up as to the factory locations.
Roddy

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It doesn’t have oxygen sensors. Not along the exhaust pipe, anyway.

What would you hook up the oxygen sensors to?

Sixto
98 E320s sedan and wagon
02 C320 wagon

Great! It's not longer a concern.
Thank you,
Roddy

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The W210 diesel has a simple oxidation catalyst downstream of the turbo. No automatic controls as there is no regeneration regime like on the later engines.

There are no sensors on the cat. This is good and bad, there are no sensors to fail, but you also don’t know if the cat gets plugged until you start realizing the “banana in the tail pipe” syndrome.

For those who come along later, there is a product by Liqui Moly that is meant for DPFs but I would imagine it would work on the earlier cats as well to clean them out.

Sixto the controls on the W210/OM606.962 (turbo 98-99) are dead stupid simple. The only devices going into the ECU (doing this from memory but after the saga last summer I about have it memorized):
Pedal position
Manifold pressure
Coolant temperature
Fuel temperature
Charge air temperature
Oil level switch
Injection pump rack position feedback
Crankshaft sensor

And the outputs are
Injection pump rack actuator
EGR vacuum transducer
Waste gate vacuum transducer
Fuel valve
Glow plug relay

It’s actually simpler than the n/a OM606.912 (96-97), you don’t have the swirl flap stuff under the intake manifold.

No oxygen sensors on this engine at all.