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Discussion Starter · #1 ·
Hello everyone,
this is my first post here sorry if I put it in the wrong place.
Since few months I am fighting with my N47D20C 177Hp
I have an error message of 004D03 - Exhaust back pressure sensor during diagnostic with Carly.
I just bought a new one (Hella) and I replace it (plug and play) but still I have the same problem.
The car is doing DPF regeneration upon request via Carly.
White Organism Font Auto part Drawing


I have replaced sensor Number 3.
I am wondering now if those 4D03 error msg related to Sensor #3 or to sensor #5?
Any help will be highly appreciated team!
Regards,
Azim
 

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Nuclear engineer
02/2012 X5 35d M57Y CPO 119K miles NOKIAN WR G3 30K miles
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23,713 Posts
BMW Fault Codes
Fault Information

Fault Code Description
The fault is detected when the difference between the exhaust gas pressure before diesel particulate filter and the ambient pressure is greater than a limit value.
Limit value: 60 mbar
Fault Code Conditions
General ConditionsWhen the engine is stopped, monitoring takes place for a certain test period during after-run of the control unit and when a waiting period has elapsed.
Waiting period: 4.7 s
Test period: 2 s
Terminal ConditionPWF status: Driving
Terminal ConditionPWF status: Testing-analysis-diagnosis
Terminal ConditionPWF status: Residing
Driving Conditions
Fault Time Condition
The fault is entered if it is present for longer than the following period: 50 ms
Service Plan
1. Check line and plug connections
2. Check the hose pipes of the sensor for damages and correct routing.
If the previous checks are OK:
Replace exhaust gas pressure sensor upstream of diesel particulate filter.
 

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E30 325e, E34 535i, E46 330Ci, E60 530i, F10 528i, F10 535d
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You are assuming the sensor is faulty and gave wrong data. Is there a chance the DPF is clogged and the sensor was actually working as intended? How many Km's do you have on the car?
 

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Discussion Starter · #5 ·
I have 258 560km on this car. I assume that the sensor is not working just because Carly is giving me this error code. Before 4 weeks I get also an error of DPF but now there iS no such an error anymore. Is it poasible to have error code on the sensor because of the DPF ?
My original auming was that I were replaced the wrong sensor nr.3 from the pic above, but I see that there ia two backside preaaure sensors, queation is which one is not working if so
 

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I have 258 560km on this car. I assume that the sensor is not working just because Carly is giving me this error code. Before 4 weeks I get also an error of DPF but now there iS no such an error anymore. Is it poasible to have error code on the sensor because of the DPF ?
My original auming was that I were replaced the wrong sensor nr.3 from the pic above, but I see that there ia two backside preaaure sensors, queation is which one is not working if so
Hi @AzimFeta
Probably not what you want to hear, but I had the same issue on my F10 520d at around 88.000 miles, same error code in Carly.
After a lot of faffing around with replacing sensors etc. in the end it turned out to be the DPF that was clogged beyond the point it could successfully complete a regen (even though I could successfully initiate a regen in Carly).
BMW says that DPF will generally last around 100.000 miles if the car is serviced on time but also depends on other factors, like oil used and driving style.
On mine, the DPF was taken out and cleaned at a DPF cleaning specialist here in the UK, and fitted back, but only lasted around 4000 miles before giving up again. Eventually, I replaced it with a low-mileage second-hand unit for around £250 and 20.000 miles since it's still going ok.
There is also the option of removing it or gutting it out and having it coded out, but it really depends on how comfortable you are with potentially breaking emissions standards or laws in your country.
 

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Discussion Starter · #7 ·
Sicca thank you for the information, realy appriciate that. This was my biggest fear because the new DPF is crazy expensive.. so I have to find a way.
I am now looking in the market there is some chinese dpfs for 5x cheap, do someone have try them ? In my county (Bulgaria) is not a problem to gutting the dpf but I am realy not fan of this...
 
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