E350 mis-fire

[NickWilmshurst]

Hi
I'm a new member and a happy owner of a 2010 E350 cgi convertible.... that was until recently.
It suddenly developed an intermittent mis-fire so I took it to a Merc "specialist" who said it was a NOX sensor issue. I agreed to have it replaced and then had to have the wiring and connector replaced as they said it was water damaged. (£1500)
Then they said it still mis-fired and the messages say the high pressure fuel pump is defective. (£3000 plus labout plus VAT).
I find it very hard to believe that two unconnected components can choose the same moment to develop faults.
Has anyone got any experience or advice?
Thanks
Nick

 

[pcthrillrider]

seems they dnt know what it is, a misfire will give a dtc code do u have a code?

 

[E53AMG]

Which "specialist" was it?

Sent from my SM-G955F using Tapatalk

 

[NickWilmshurst]

Wheels VT in Beaconsfield

 

[esscee]

As previously mentioned, what Merc "specialist" was it? There are a fair few well respected and trusted "Indys" around. If you state your location in more detail then a good chance someone can recommend one for you. Does seem a little strange.

 

[phillj]

Hi
I'm a new member and a happy owner of a 2010 E350 cgi convertible.... that was until recently.
It suddenly developed an intermittent mis-fire so I took it to a Merc "specialist" who said it was a NOX sensor issue. I agreed to have it replaced and then had to have the wiring and connector replaced as they said it was water damaged. (£1500)
Then they said it still mis-fired and the messages say the high pressure fuel pump is defective. (£3000 plus labout plus VAT).
I find it very hard to believe that two unconnected components can choose the same moment to develop faults.
Has anyone got any experience or advice?
Thanks
Nick

Star Motor Services in Reading
John Griffiths Reading

Get a second opinion from an indy with proper Mercedes diagnostic kit

Wheels VT website does not mention having Mercedes diagnostics

 

[Fununcle]

I would start with cool packs, cheap and easy to change.