M340d 3rd time engine light on - DPF sensor
Discussion
Anyone else suffering like me and my father with his? Both of ours have been in twice under warranty for replacement DPF sensors. My engine light has come on again today. It's a 21 plate on 20k miles (he's on about 12k). Admittedly I do a 5 minute commute most days but it gets a good run most weekends. I've had diesels for over 10 years now and never experienced this. Just wondering what to do going forwards as I love the car...?
A mate lent out one of his cars recently to a friend in need, who appears to have driven similar to you for a month. The day after it was returned, the DPF light came on. BMW fixed it, advised premium diesel/additives help, but won't cure.
That's a journey for an electric car, walking, bike etc. No combustion engine will enjoy that trip, too short, not hot.
That's a journey for an electric car, walking, bike etc. No combustion engine will enjoy that trip, too short, not hot.
_Hoppers said:
From the OP’s post the problem doesn’t appear to be a clogged DPF but a failed sensor.
True, however they've suffered issues with these sensors, and one of the causes has been through condensation - I thought the new ones had solved the problem. Giving the driving profile, that seems likely to be part of the culprit on continued failures.Ky said:
Hi, my 2022 plate had engine management light on which has been diagnosed as dpf sensor fault.
Just drove 500 miles in a day on Friday up north and back so wouldn't think actual dpf could be clogged. Let's see when I get it back. Currently with dealer now.
There are 6 sensors in the DPF. 2 x oxygen sensor, 2 x pressure sensor and 2 x temperature sensor. Let's hope they diagnose it correctly and don't throw all 6 at it.Just drove 500 miles in a day on Friday up north and back so wouldn't think actual dpf could be clogged. Let's see when I get it back. Currently with dealer now.
Mafioso said:
rassi said:
Have you also had a problem about the gearbox not going into 8th, and only stays in 7th even at higher speed?
No I don't think so. Does it do this if it's doing a regen?richyd said:
My 2022 M340d has just been diagnosed with the same problem. BMW Assist came out and diagnosed it on my driveway, faulty DPF sensor.
Going in to dealer in 2 weeks to have the replacement part fitted.
What sort of driving do you do? I just think this is something that will happen every year with mine...Going in to dealer in 2 weeks to have the replacement part fitted.
Have you read the codes yourself ? Carly is great for this.
My 2020 520d had an EML on when I bought it, BMW were tasked with diagnosing and fitted a DPF sensor (57k). The day after I collected the car the EML came back on, then went off. A few k later it started coming on intermittently then permanently as the NOx sensor. There were 4 related codes.
There might be more than one faulty sensor. They are not cheap. The NOx was £450 for the part alone which blows my mind. Luckily the supplying dealer was still on the hook for it.
I do a number of short journeys too but usually get up to temperature. On the weekends I tend do longer drives and have had multiple diesels with no issues.
My 2020 520d had an EML on when I bought it, BMW were tasked with diagnosing and fitted a DPF sensor (57k). The day after I collected the car the EML came back on, then went off. A few k later it started coming on intermittently then permanently as the NOx sensor. There were 4 related codes.
There might be more than one faulty sensor. They are not cheap. The NOx was £450 for the part alone which blows my mind. Luckily the supplying dealer was still on the hook for it.
I do a number of short journeys too but usually get up to temperature. On the weekends I tend do longer drives and have had multiple diesels with no issues.
Mafioso said:
richyd said:
My 2022 M340d has just been diagnosed with the same problem. BMW Assist came out and diagnosed it on my driveway, faulty DPF sensor.
Going in to dealer in 2 weeks to have the replacement part fitted.
What sort of driving do you do? I just think this is something that will happen every year with mine...Going in to dealer in 2 weeks to have the replacement part fitted.
Sensor replaced today under warranty. 3 hr job including the wash and hoover
DJMC said:
When we buys these cars new are we told "Oh, and by the way you can only do certain types of driving, and also your car may catch fire due to us putting in a plastic intake manifold after years of metal ones."
No.
Design fault I say.
Class action.
The 40 and 50Ds have a metal intake.No.
Design fault I say.
Class action.
Blame Brussels, not BMW. They forced all these emission controls onto all car manufacturers but didn't mandate simple and cost effective maintenance of said components. £2K for a DPF, £500 for an EGR cooler, £250 for an EGR valve, £700 for a plastic intake, £300 O2 sensors, silly money EGR temp sensors, silly money DPF differential pressure sensors etc etc. All priced according to importance....i.e. the engine won't run properly without said emissions controls, forcing you to comply and cough up, or have a sht running car.
This is why people gut DPFs and remap engines to code out the EGR.
Petrol turbo engines are no longer allowed to add fuel enrichment in boost either, hence why there are so many hybrids now, further adding to the spiralling maintenance merry go round.
richyd said:
Mafioso said:
richyd said:
My 2022 M340d has just been diagnosed with the same problem. BMW Assist came out and diagnosed it on my driveway, faulty DPF sensor.
Going in to dealer in 2 weeks to have the replacement part fitted.
What sort of driving do you do? I just think this is something that will happen every year with mine...Going in to dealer in 2 weeks to have the replacement part fitted.
Sensor replaced today under warranty. 3 hr job including the wash and hoover
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