Maf error /Cel Light

[Malcolm Johnson]

Just want to pass on my experience re what turned out to be a Maf error. My CEL came on and my local indie spotted that i had fitted the wrong turbo seal when i had replaced the air filters 3 months previously. Which i felt embarrassed about. Couple of Days later the Cel came on again so i took it back and my indie who believed as i'm no longer using the car as a work vehicle the dpf had filled up. I was surprised re the diagnosis. He drove the car and put it in regen mode. ( Auto regen normally) I checked dpf myself after and it was empty.

Two days later the CEL came on. I rang the indie and said it had come on a third time and my icar soft was pointing in the direction of the right hand side MAF sensor as i had mentioned on my previous visit.

I said i would investigate the issue myself and if i couldn't solve the problem myself i would contact them again.
So i removed all the hoses/piping/seals to allow me to remove the MAF sensors. As they are protected/encased piping with a wire cage to keep foreign objects off the sensors. I put a wd40 can plastic tube into my electrical contact cleaner can which allowed me go through the wire cage and clean/blast both sensors vigorously.

That was three weeks ago (400 miles). Presently no CEL has returned and the economy has had a noticeable improvement.!!!.
So that was my issue/experience.

 

[Malcolm Johnson]

The story continued, early December the CEL came back on with the same error, the electrical cleaner had only worked temporarily. So i ordered two replacement Maf's from a Maf company in Berlin. I replaced the The two Mafs which got rid of the original error but created a ECU non read/compatible error.
so returned and received a refund. Put the old mafs back on. The car functions fine with a CEL.
I ordered the the full Mercedes Maf and hose Assembly which i installed. All is well now.
What i have learnt is sometimes you have to buy from a Mercedes dealer , but it has been a educational trip which i answered and solved myself.
Five years ago i would have just thrown money at a indie, but as i'm retired i have the time to play with my old work car.

 

[mioba]

Well done OP.
Mercs are known to throw tantrums with non genuine electrical parts.
I stick to MB parts, never have any issues (fitting, further errors, sending things back, downtime etc etc).
My learned MB enthusiast @EmilysDad agrees too (lol).