Engine management code help request P220101

[Wenglish]

Hello everyone had the car around 2 weeks now Its a E350 3.5 petrol and yesterday evening I noticed after filling up with Tesco mementom petrol that the engine management light appeared. I’ve experienced no loss of power but have noticed very poor MPG since

I had a diagnostic check done today’s a garage using a snap on machine and it had a stored code of P220101 and the mechanic had no idea what it meant as it had no name next to it. He said most codes are only 4 digits this one is 6. I’ve since been doing some online searching and looks like it points to the knock sensor

Has anyone experienced this issue before ?

Any help would be grateful thanks

 

[Trickythemerc]

More likely to be an oxy sensor/lmbda probe. The poor fuel consumption is the key here I think, it will be causing the fuel trims to go rich as a fail safe measure. Who was the mechanic ? Wurzel Gummidge

 

[Wenglish]

More likely to be an oxy sensor/lmbda probe. The poor fuel consumption is the key here I think, it will be causing the fuel trims to go rich as a fail safe measure. Who was the mechanic ? Wurzel Gummidge

Thanks for the quick reply mate I just hope it’s nothing to serious I’ve priced up a knock sensor on eBay looking at around £280 + but that’s from Poland which is obviously something I could ideally do without after spending so much on the car already in the last 2 weeks. I’ll call Mercedes soon for a price locally

There is one video on YouTube showing a how to etc with the fault code I have and part number he used which resolved his problem so might just replace it and see what happens

Would you think it’s ok to drive while I wait for the part ? Like I said before there is no loss of power etc ?

Thanks

 

[Trickythemerc]

I think you are confusing a nox/oxy sensor with a knock sensor.

 

[Wenglish]

I think you are confusing a nox/oxy sensor with a knock sensor.

Yes you are correct It’s a nox/oxy sensor my fault thanks for clarifying