O2 sensor ? Nox sensor?

[Benz Carl]

Hello merc humans.

Can you please shine some light in my question, I have a W213 220d Amg ‘17 and I have the check engine light for an O2 sensor which to my understanding is situated somewhere below the engine.

Deleted the light a couple of times and only once I saw a message not really remember exactly saying exhaust cleaning/ nox sensor.

also very strange if the car sits uphill or on a verge for a while the check light disappears and only after some driving comes back on without any message.

the question is how do I clean it or replace it ?

many thanks.

 

[Blobcat]

Hello and welcome

Have you had a software update or service at Mercedes recently?

 

[Benz Carl]

No, I didn’t. Just deleted the error twice.

I was reading now On an adblue issue and people also talking about the nox sensor on this forum.

I apologize if my problem is related to that thread and I’m just overwhelming the forum.

 

[Benz Carl]

Update, changed the soft, more power and more mpg, no more check engine lights.

 

[Botus]

check this post

Engine light on - nox sensor needs replacing?

Good evening, I have a Mercedes e class coupe 2016 and a few weeks ago after filling up the coolant the engine light came on and collision break inoperative warning light. i took it to my local garage and was advised two sensors need replacing; the nox sensor and the collision sensor. Whilst...

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