Great explanation.lets hope we don't see you back in a month (with the same fault) then.....
the fix is software (which can only be applied with the latest sensors you won't find listed on any parts site)
UPDATE: So after the software 'upgrade' the EM light went off and apparently no error codes on their system. Happy days well for two days and the engine mgt light back on. Personally I think they just recalibrated and hoped for the best. Any hoo, I challenged them and car booked in for the nth time to have the NOx sensors replaced. Now I had a Resolver.com claim in with MBUK which had two weeks to go before it would be escalated to MBUK's MD. I had an email back from MBUK HQ saying 'they were not a compensation organisation and I should go through the retailer'. Fair enough, back to the MB retailer in Hemel.
So booked in, then told they would need to keep the car overnight as one of the NOx sensors was delivered faulty when they tested it and they had ordered a new one! So driving in their courtesy car and then have to go back for 5pm to collect mine. I told them I didn't expect to get a bill for £1500 and I didn't. Good will claim to HQ and agreed.
All in all very stressful but very glad to get back into my E220 estate. Car working fine without the reported problems after the upgrade. I have a 7-speed. Have they changed the upgrade?
Hope my blether helps - I do recommend resolver.com for putting pressure on large organisations and streamlining the complaints process for free.
Also 20% off service plans which brings them down to the independents' pricing near me - finishes end September.
Mine is showing faults, afer a free software update by MB. £1000 looks steep doesn't it?I have recently had my auxiliary battery replaced so my stop/start works now. When paying my bill, I was presented with output from XENTRY that both NOx sensors needed replacing. Apparently, there is a shortage of them and they could install one new and one refurb for £1000. On another forum I read a lot of posts about NOx sensor failures. Some of which had been replaced FOC by MB. Is this a known problem?
Anybody else had this problem? It is ok apparently to drive the car but the correct amount of AdBlue won't be delivered to the engine. I have not had a recall letter to do the software upgrade yet for removing the cheat software. Anybody experienced this or got some goodwill from MB?
Any help much appreciated as I don't know how to proceed.