S. Madman

As the title say I have an O2 sensor DTC, and I think is the bottom passenger side.

Thinking of tackling this, but not sure if a lift is required for all 4 sensors.

Done 02 sensors before on other cars, but don't want to bite more than I can chew.

How accessible is this?

nota_amg

the sensors are accessible, it's the connectors that are a pain. All 4 connectors are attached to metal brackets at the top of the transmission housing. I used a lift...it MIGHT be doable without one, but I don't think I'd want to.

S. Madman

Ok thanks, I have slippery hands. Let see if I can reach them.

Got all 4 bosch with the removal tool tax and next day shipping for $200.

ghlkal

That's good to know. I thought I read that accessing the front O2 sensors required dropping the exhaust or raising the engine

S. Madman

That is why I was asking

nota_amg

Don't get me wrong, I don't know if they can be removed with the exhaust on the car, I removed mine to do the job, but I was installing downpipes. You MIGHT be able to get them out with the exhaust in place, but it WILL be a challenge if you can. Sorry, was not my intention to give you false hope...

S. Madman

Did you have to shift the engine mounts to take your downpipes out?

nota_amg

No, not at all. Also a word of caution. If you do pull the downpipes, make sure you use only hand tools on the collector bolts. I used a 3/8" impact and damaged the nuts, that are pressed into the bridge pipes, and Mercedes doesn't make a proper sized replacement so they suggest you replace the bridge pipes. I used and older, copper "square-nut" and modified them so they would stay in place. It was a pain.

S. Madman

Yeah, got big Bertha (pry bar) to assist me in loosening everything up.

Thanks for the heads up.

S. Madman

Double post.

nota_amg

Gotcha...I use Mr. Rubble: