[ilmdc]

I had a diesel induction service performed on my 335d about two months ago at a BMW dealer in the area. This service was of the variety of pushing cleaner through the air intake system, and not the more involved walnut blasting, or chemical cleaning of the manifold.

No SES lights, or other issues ahead of the service. As the car was at 50,000 miles, I thought the service may help prevent more costly soot related issues down the road.

About a week ago, while getting onto the interstate, I pushed the car a bit more than normal, and instantly got an SES light for:

4C7C - Reducing Agent metering valve actuation
3FF1 - Air flow meter signal / Air mass meter
4868 - Air system, EGR

Visited the dealer and had the air mass sensor, charge air temperature sensor, and SCR metering value replaced.


Wondering if these sensor / injectors were affected by the diesel induction service knocking stuff loose and clogging up sensors and injectors. Also wanted to know if an oil change ahead of schedule is recommend if the cleaning added to the soot load of the oil?

Thankfully, have the extended warranty, so the 700 mile over factory warranty for this issue was not major $$!

Ian

[floydarogers]

The SCR metering valve probably can't be affected - it's too far downstream (bottom of DPF/Oxidation Catalyst) for anything like that to cause problems.

The EGR and AFM, though, quite possibly could have been affected by it.

[austinla335d]

And the soot in the intake tract never makes it into the oil- separate areas entirely, both proverbial closed circuits. Oil change not necessary.

[F32Fleet]

My guess is that it had nothing to do with the other. I lost both NOX sensors, 3 DEF tanks, one SCR catalyst, and one SCR control module between 50k-65k miles.