335D E91 DPF light

[thomas-dqdmt]

hello all

Ive not long had a 335d E91 and the dreaded dpf light has made its appearance, the cars done 75K as soon as you open up past 50 the light appears, leave the car overnight and it disappears. But will do the exact same the following day.

I have changed from a 330d which also felt much more responsive and quicker.

is there anyway i can force regen the DPF? i have also read about thermostats that can cause problems?

Any help would be much appreciated!

[Welshbeef]

Can you rev the engine out to the limiter or does it prevent you?


Have you tired running it at 3k revs for 5 Miles on the M way?
Have you kept it in sport mode for gearbox for an entire commute/long drive?

[thomas-dqdmt]

it revs how it should, just seems as if its holding back

i tried around 15 miles on the motorway at 3k and also the same in DS with no change

[Welshbeef]

Have you done an entire commute or say 60+ miles with the gearbox left in DS?

[thomas-dqdmt]

i did a 110 mile drive yesterday, around 30 miles at 3k revs in DS

[Dewithedragon]

The dpf itself is probably fine. Its quite common that if the thermostats are stuck open, the car will never get up to proper operating temp. If this happens the car will not regen.

have a look at this post https://www.e90post.com/forums/showthread.php?t=14...

& also this info from bmw http://australiancar.reviews/_pdfs/BMW_X5-X6_E70-E...

it goes into some detail as to causes for failed regens. going for a long drive will only help if the root cause is fixed first.

Get a diagnostic read out and also take a look at the live data. if the car sits around 75c or lower that will be your problem.

A 335d with good thermostats (theres 2 of them egr & main) will sit around 90c

Edited by Dewithedragon on Thursday 20th September 21:20

[Welshbeef]

On my E90 330d it was perfectly fine at 113k miles and still showed a service life of at least 150k total miles Per idrive.

[helix402]

A BMW Dpf won’t regen, forced or normal if any fault codes are stored relating to the Dpf. As mentioned in the last post the cause of the problem is rarely the Dpf itself. BMW Dpf faults are straightforward to fix if you understand how they work. Sadly a lot of people don’t.

[tommyt01]

Thanks for all the help, I will access to hidden menu tomorow and check the running temp on the way to work, hopefully a low running temp will be found and I’ll get some stats on order.

Is it always best to go genuine? Or any good oe quality brands if ones needed

[helix402]

Genuine BMW stats last longest.

[tommyt01]

Just drove to work, pretty hard in places, max temp on the motorway was 74 degrees. Time to order some new thermostats!

[Dewithedragon]

Order the genuine bmw ones. Don't mess about with aftermarket. Otherwise you'll be doing them again shortly.

One other thing. There is a specific torque patten for the egr cooler that was introduced after bmw had issues with some of them cracking and leaking small amounts of coolant into the exhaust. I think there's a link on one of the pages I posted. It's also avail from the bmw TIS.

There's also a coolant pipe that goes around the oil filter. With this you don't have to take the pipe off you will just need to losen the mounting bolts to move it out if the way. So you can get the main stat off.

[edition]

Dependant on what year your car is you might only have the main thermostat.

Like above comments get it or those changed you will then need to get a code reader to wipe the code. You might need to do this over and over with someone driving the car.

[tommyt01]

What’s the best code reader to get?

[edition]

Carly seems to get good reviews.

Where are you based?

[tommyt01]

I’m just east of Birmingham

[Dewithedragon]

tommyt01 said:

What’s the best code reader to get?

Carly is ok

also bimmergeeks pro tools is new on android. - its very much a mobile version of BMW inpa with a huge set of coding tools.

very fast as well