CRA on used car at 11 months - Fault reoccured
Discussion
Hi all
Had a few issues with my 520d, it has literally 3 days of warranty left as it was purchased Jan 30th last year.
New DPF sensor fitted at purchase.
NoX sensor fitted under CRA / Warranty at 5-6 months at no charge due to new engine light.
Engine light came on again, DPF was blocked (manually tested at 2.5x the permissible max)
DPF has been cleaned by the same garage who fitted the NoX. Clean successful but engine light still on.
Current code does not relate to NoX but Autologic got sent the logs and said that the NoX is likely the cause and might be why the DPF got blocked.
I'm already £600 in on the DPF side of things at this point. My question is the fault was present and fixed within the 6 months of the CRA and was 'present' when I bought the car. Garage no fuss agreed to sort, but, it was pushed through the warranty co somehow even though it is not listed as a covered part.
Is there any point on the CRA side of things bringing this back to the supplying garage as ultimately the fix has failed? I assume the part should be covered as it's 6 months old and was about £450! the labour to fit was just shy of £200.
Had a few issues with my 520d, it has literally 3 days of warranty left as it was purchased Jan 30th last year.
New DPF sensor fitted at purchase.
NoX sensor fitted under CRA / Warranty at 5-6 months at no charge due to new engine light.
Engine light came on again, DPF was blocked (manually tested at 2.5x the permissible max)
DPF has been cleaned by the same garage who fitted the NoX. Clean successful but engine light still on.
Current code does not relate to NoX but Autologic got sent the logs and said that the NoX is likely the cause and might be why the DPF got blocked.
I'm already £600 in on the DPF side of things at this point. My question is the fault was present and fixed within the 6 months of the CRA and was 'present' when I bought the car. Garage no fuss agreed to sort, but, it was pushed through the warranty co somehow even though it is not listed as a covered part.
Is there any point on the CRA side of things bringing this back to the supplying garage as ultimately the fix has failed? I assume the part should be covered as it's 6 months old and was about £450! the labour to fit was just shy of £200.
BQR has just bought a 520d and had similar levels of sooting, the remapper told him it was a pre/post cat sensor.
Not sure which two of the three videos it's mentioned in....
https://youtu.be/FKTPyxV0CnY
Not sure which two of the three videos it's mentioned in....
https://youtu.be/FKTPyxV0CnY
How old is the car? What mileage?
How many miles since buying the car?
A mate has recently had a DPF in a 2 litre BM. They have a finite life.
The DPF is also a catalytic convertor his car, so once the catalysis isn't happening properly, you want a new one rather than fart about cleaning it.
A new DPF from a relatively reputable aftermarket supplier cost £450 or so, but the alternative was £250 of labour and snake oil to clean it.
Total bill was over £700, but hopefully that will keep the car sweet for a few years.
There are grey areas, but I'm inclined to think a DPF is something you expect to replace at some point.
IMHO, that shouldn't be before 80k miles unless the car is really abused with short trips?
I've also heard credible people say some DPFs can disintegrate and block themselves after cleaning.
How many miles since buying the car?
A mate has recently had a DPF in a 2 litre BM. They have a finite life.
The DPF is also a catalytic convertor his car, so once the catalysis isn't happening properly, you want a new one rather than fart about cleaning it.
A new DPF from a relatively reputable aftermarket supplier cost £450 or so, but the alternative was £250 of labour and snake oil to clean it.
Total bill was over £700, but hopefully that will keep the car sweet for a few years.
There are grey areas, but I'm inclined to think a DPF is something you expect to replace at some point.
IMHO, that shouldn't be before 80k miles unless the car is really abused with short trips?
I've also heard credible people say some DPFs can disintegrate and block themselves after cleaning.
OutInTheShed said:
How old is the car? What mileage?
How many miles since buying the car?
A mate has recently had a DPF in a 2 litre BM. They have a finite life.
The DPF is also a catalytic convertor his car, so once the catalysis isn't happening properly, you want a new one rather than fart about cleaning it.
A new DPF from a relatively reputable aftermarket supplier cost £450 or so, but the alternative was £250 of labour and snake oil to clean it.
Total bill was over £700, but hopefully that will keep the car sweet for a few years.
There are grey areas, but I'm inclined to think a DPF is something you expect to replace at some point.
IMHO, that shouldn't be before 80k miles unless the car is really abused with short trips?
I've also heard credible people say some DPFs can disintegrate and block themselves after cleaning.
Mine is a 2020/69 plate which is a pre LCI G30 but has the LCI engine and I drive systems (i.e. it is a mild hybrid). How many miles since buying the car?
A mate has recently had a DPF in a 2 litre BM. They have a finite life.
The DPF is also a catalytic convertor his car, so once the catalysis isn't happening properly, you want a new one rather than fart about cleaning it.
A new DPF from a relatively reputable aftermarket supplier cost £450 or so, but the alternative was £250 of labour and snake oil to clean it.
Total bill was over £700, but hopefully that will keep the car sweet for a few years.
There are grey areas, but I'm inclined to think a DPF is something you expect to replace at some point.
IMHO, that shouldn't be before 80k miles unless the car is really abused with short trips?
I've also heard credible people say some DPFs can disintegrate and block themselves after cleaning.
Currently on 67k - The garage thinks that the NoX sensor may have caused the DPF to block up, light wasn't on for long though and regenerated fine using Carly with no soot or ash reported at the end.
The average MPG since factory on the car is 51mpg which points to motorway miles mostly, I have recently moved house and my journeys and lifestyle has switched to short journeys - but I have only been here since the end of November so realistically it wouldn't have caused it so soon - I have done a few 50 mile journeys in that time.
I have just dropped the car off at the garage again (A specialist, not the supplying dealer, however the supplying dealer pointed me to them as they are RAC approved in line with my warranty). They are rescanning it today and then taking it to BMW. If it is the NoX sensor, BMW will replace it under the parts warranty.
God knows what if it isn't that though.....
Main question is though if its related to the NoX can I force the supplying dealer to pick up any of this at this late juncture given it is a fault that initially occurred in the CRA 6 month window?
Sticks. said:
I don't know if it still is but iirc, work done by a BMW dealership is guaranteed for 12 months.
Part supplied by them but fitted by specialist. I think they misdiagnosed the error as being DPF related, and just coincdence the pressure was high on it.
It does definitely drive better after cleaning I can feel it is quicker, so guess I just need to look at the cost so far as preventative maintenance.
joropug said:
Mine is a 2020/69 plate which is a pre LCI G30 but has the LCI engine and I drive systems (i.e. it is a mild hybrid).
Currently on 67k - The garage thinks that the NoX sensor may have caused the DPF to block up, light wasn't on for long though and regenerated fine using Carly with no soot or ash reported at the end.
The average MPG since factory on the car is 51mpg which points to motorway miles mostly, I have recently moved house and my journeys and lifestyle has switched to short journeys - but I have only been here since the end of November so realistically it wouldn't have caused it so soon - I have done a few 50 mile journeys in that time.
I have just dropped the car off at the garage again (A specialist, not the supplying dealer, however the supplying dealer pointed me to them as they are RAC approved in line with my warranty). They are rescanning it today and then taking it to BMW. If it is the NoX sensor, BMW will replace it under the parts warranty.
God knows what if it isn't that though.....
Main question is though if its related to the NoX can I force the supplying dealer to pick up any of this at this late juncture given it is a fault that initially occurred in the CRA 6 month window?
So it's a much newer car than my mate's.Currently on 67k - The garage thinks that the NoX sensor may have caused the DPF to block up, light wasn't on for long though and regenerated fine using Carly with no soot or ash reported at the end.
The average MPG since factory on the car is 51mpg which points to motorway miles mostly, I have recently moved house and my journeys and lifestyle has switched to short journeys - but I have only been here since the end of November so realistically it wouldn't have caused it so soon - I have done a few 50 mile journeys in that time.
I have just dropped the car off at the garage again (A specialist, not the supplying dealer, however the supplying dealer pointed me to them as they are RAC approved in line with my warranty). They are rescanning it today and then taking it to BMW. If it is the NoX sensor, BMW will replace it under the parts warranty.
God knows what if it isn't that though.....
Main question is though if its related to the NoX can I force the supplying dealer to pick up any of this at this late juncture given it is a fault that initially occurred in the CRA 6 month window?
I presume it's an adblue system, with the NOx sensor.
There is a lot going on here, every part of the system affects every other part and you could quickly get into deep arguments about what is a root cause and what is a symptom. I'm not totally clear about the details of anything this modern. What is the chain of causality which makes a dodgy NOx sensor block the DPF? I guess all the sensors feed into the software and the software fiddles with everything, so a fault anywhere can have consequences elsewhere. But equally some other fault could both block the DPF and poison the NOx sensor. Some other sensor could be out of cal, there could be issues with swirl flaps, injectors, EGR system or even fundamental things like piston rings. Proper diagnosis isn't trivial.
I know when to admit I'm getting out of my depth.
Likewise my knowledge/experience of the CRA is limited, I've had fair outcomes myself, and know people who've had good and poor outcomes, both consumers and retailers. I feel it's going to be tough 'proving' any fault was there 11 months ago. I would imagine there is data in the ECU which logs all sorts of stuff long before it thinks there's enough of a problem to show an error light.
I understand it can matter how many miles you've put on the car since purchase.
I can’t advise on the CRA but I can say that the OP’s assumption of a direct link between the different faults and repairs is fairly dubious as is AL’s conclusion that a blocked DPF is likely to be caused by a NOx sensor fault (that isn’t flagging as a NOx sensor).
Proper diagnostics are required here.
Proper diagnostics are required here.
The original fix (within the 6 months) didn't fail. What's happened is another different part has failed (outside of the 6 months) but the symptom is the same. It needs diagnosing properly instead of a garage simply guessing that a sensor has caused some kind of suboptimal running which has gradually led to a DPF blockage.
Uglychild said:
loskie said:
would that be legal?
Would it pass an MOT?
Not legal but nobody would find out, yes it would pass an MOT (You could put a bottle of Redex in the tank just before to make sure) Would it pass an MOT?
I've just had all this done to my car, no need to get the Dpf gutted either
Steve H said:
Uglychild said:
loskie said:
would that be legal?
Would it pass an MOT?
Not legal but nobody would find out, yes it would pass an MOT (You could put a bottle of Redex in the tank just before to make sure) Would it pass an MOT?
I've just had all this done to my car, no need to get the Dpf gutted either
^^^^ Wot 'e said.
Uglychild said:
Why not get the Dpf and EGR mapped out with a cheeky stage 1 tune done at the same time?
Because when the particulate testing MOT rules come in (currently being trialled in 10 locations), the car won't pass an MOT. Removing it is such poor advice given the current proposals around this.Gassing Station | Speed, Plod & the Law | Top of Page | What's New | My Stuff