2015 Mercedes Benz M Class 350 bluets Loss of MPG and performance after SRPC1921

Nick Georgiou

Problem added: Mar 14, 2020 (3 months ago)
Hi there

Many owners of the W166 MERCEDES who have had the recall SRPC1921 are experiencing issues. Loss of MPG, loss of performance, running rich, rough idle and hesitant when cold.

Have reported back to Mercedes and yet they are to respond. Please can you help us? I have been on a lot of W166 forums and all are experiencing the same issues since the recall.

Please please help us.

Car details
Car: Mercedes Benz M Class
Variant: 350 bluets
Model Year: 2015
Category: Engine & Drivetrain
Running Rough, Starting & Power Loss
Electrics, ECU, Warnings & Lights

Recalls: Mercedes Benz M Class Recalls
More: Mercedes Benz M Class Problems
Replies and solutions
Fixes: 12,408
Mar 14, 2020 (3 months ago)
Cant help you with that , I'm afraid . You will have to take it up with Mercedes as the software recall is emissions related which ties in with what you and others are experiencing .
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