Gökhan
High emission values at the MFK: particulate filter or lambda sensor?
(Translated from German)
Summary of the thread
The conversation centers around high exhaust emissions in a BMW X3, with a measured value significantly exceeding the target. The workshop suggested a clogged particulate filter as the cause, but the vehicle showed no typical symptoms. Error codes indicated potential issues with the lambda sensor. Initial steps included a forced regeneration, which temporarily reduced emissions. The discussion explored checking and cleaning the lambda sensor and considering its replacement as a preventive measure. A chemical additive for the DPF was suggested as a next step, with further investigation into engine issues if problems persist.
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9 comment(s)
Gökhan (community.author)
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Start by checking the lambda sensor connections and wiring for any visible damage or loose connections, as these can affect sensor readings. If everything looks fine, consider cleaning the lambda sensor to see if it improves the readings. If the issue persists, it might be worth replacing the lambda sensor before moving on to more costly repairs like the particulate filter. Keep an eye on any changes in performance or emissions after these checks. Let me know how it goes or if you have further questions!
I did a forced regeneration today and will have the exhaust gas values measured again tomorrow. Otherwise, as you said, I will check and clean the lines. I will continue to report.
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CarlyMechanic
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I did a forced regeneration today and will have the exhaust gas values measured again tomorrow. Otherwise, as you said, I will check and clean the lines. I will continue to report.
Great, performing a forced regeneration is a good step. After checking the exhaust gas values, if the issue persists, inspect the lambda sensor connections and clean them as planned. Keep us updated on the results, and feel free to ask if you have any further questions!
Gökhan (community.author)
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Great, performing a forced regeneration is a good step. After checking the exhaust gas values, if the issue persists, inspect the lambda sensor connections and clean them as planned. Keep us updated on the results, and feel free to ask if you have any further questions!
On Saturday, I performed a forced regeneration with Carly Software and measured the values again today. The result was impressive: The soot load has dropped from 1034.5 k#/cm³ to 9.7 k#/cm³. Regarding the lambda sensor, I'm still unsure whether a replacement is necessary, as the error persists when reading out the data. I will examine this more closely. Thank you for your helpful information!
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CarlyMechanic
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On Saturday, I performed a forced regeneration with Carly Software and measured the values again today. The result was impressive: The soot load has dropped from 1034.5 k#/cm³ to 9.7 k#/cm³. Regarding the lambda sensor, I'm still unsure whether a replacement is necessary, as the error persists when reading out the data. I will examine this more closely. Thank you for your helpful information!
If the error persists, try swapping the lambda sensor with a known good one if possible, to see if the error clears. This can help determine if the sensor itself is faulty. Keep us posted on your findings, and let me know if you have any more questions!
Gökhan (community.author)
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If the error persists, try swapping the lambda sensor with a known good one if possible, to see if the error clears. This can help determine if the sensor itself is faulty. Keep us posted on your findings, and let me know if you have any more questions!
That will take a while until I can check it and replace it. My workshop recommends replacing it anyway between 100,000 and 120,000 kilometers, whether it's broken or not, because it's a wear part. What do you think?
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CarlyMechanic
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That will take a while until I can check it and replace it. My workshop recommends replacing it anyway between 100,000 and 120,000 kilometers, whether it's broken or not, because it's a wear part. What do you think?
Replacing the lambda sensor as a preventive measure between 100,000 and 120,000 kilometers is a common practice, as it can degrade over time and affect performance and emissions. If you're nearing that mileage and still experiencing issues, it might be wise to replace it. Let me know if you have any further questions!
Gökhan (community.author)
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Replacing the lambda sensor as a preventive measure between 100,000 and 120,000 kilometers is a common practice, as it can degrade over time and affect performance and emissions. If you're nearing that mileage and still experiencing issues, it might be wise to replace it. Let me know if you have any further questions!
Today I went back to the MFK (vehicle inspection) hoping that the exhaust emission values would be okay, but unfortunately they were too high again: 700,000#/cm3. Last week, after the forced regeneration, they were only 9,000#/cm3. I only drove twice in a week and the values are already so high. What could be the cause? First, I'll try a chemical additive in the DPF to clean it. What do you think about that?
(community_translated_from_language)
CarlyMechanic
community_quotation:
community_author_wrote_on
Today I went back to the MFK (vehicle inspection) hoping that the exhaust emission values would be okay, but unfortunately they were too high again: 700,000#/cm3. Last week, after the forced regeneration, they were only 9,000#/cm3. I only drove twice in a week and the values are already so high. What could be the cause? First, I'll try a chemical additive in the DPF to clean it. What do you think about that?
Using a chemical additive to clean the DPF can be a helpful step, especially if the filter is partially clogged. Make sure to follow the product instructions carefully. If the problem persists, it might be worth investigating potential issues with the engine that could be causing excessive soot production, such as faulty injectors or turbocharger problems. Keep us updated on the results, and feel free to ask if you have more questions!
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BMW
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X3
CarlyMechanic
Start by checking the lambda sensor connections and wiring for any visible damage or loose connections, as these can affect sensor readings. If everything looks fine, consider cleaning the lambda sensor to see if it improves the readings. If the issue persists, it might be worth replacing the lambda sensor before moving on to more costly repairs like the particulate filter. Keep an eye on any changes in performance or emissions after these checks. Let me know how it goes or if you have further questions!