2014 A class 2L, DPS sensors gone

[LORRI BEARDSMORE]

Hi My son car had a service at Mercedes specialist a week ago and 2 nights ago the engine light came on. He thought this morning it went into limp mode but was still able to do up to 50mph so I am not sure.
Garage have run diagnostic today and said he needs 2 DPS sensors plus inlet port shutter was showing fault. £600 to do both things

Was told the DPS filters were because the car only does short ish trips daily with no real chance to accelerate above 60mph every so often to clear filters?? and now too late just to blast it on motorway. No one mentions these things when you buy the car that it needs a good higher speed run every so often.

co incidence or anything that could have happened at service?

 

[mattkh]

Is it petrol or diesel.
Is it manual or automatic.
What is the mileage.

 

[Rappey69]

I think you mean dpf filter (diesel particulate filter)
My sensor was not working but it had no effect on the car for many miles that was noticeable and it covered 22,000km since the last regeneration (clean out) of the dpf.. Point being your sons sensors could have been faulty a long time before the service..
Eventually the engine management light will come on putting the car in to limp mode, reducing the engines power.
The cars handbook actually tells you that about every 500km the car needs a good run to allow the dpf to regenerate if the car has been subject to lots of very short journeys.

 

[LORRI BEARDSMORE]

Hi
Its diesel & automatic & I did mean DPF! Mileage I can't remember but around 60k maybe.

He only does short journeys of about 6 miles twice a day and then some that are around 10 miles. Not done much long distance for a few months.

Just wondering if it just needs cleaning?, but its booked in for a new one tomorrow now.

Is this problem on the newer cars? how often would it need changing?

 

[Rappey69]

At only 10 miles the car will never reach full running temp … The dpf filter is like a silencer, part of the exhaust system so its not a great thing to have to change... mine was 400% full, yet they took it for a half hr drive and forced it to regenerate and that did the trick.
Does your sons really need changing??? It may only need to be regenerated (cleaned) by the car using the appropriate Mercedes tools..
Car has to be fully hot, engine and gearbox, usually around 15 mins of continuous driving, then at a constant speed the car will regenerate the dpf filter.. If its blocked above 200% then it needs the Mercedes software (star) to force a regen.
If the car is taken for a long drive every 500km to regen then the dpf filter I would imagine would last well into 200,000 miles.
Sounds like a diesel car is not the right car for your son.

 

[Steve@Avantgarde]

There is an engine software upgrade available for this as well as a DPF regen.