BMW 5 Series NOx Issues: Check Engine & Failed Emissions

Hey all! Having trouble with my 2002 BMW 5 series with gas engine. The check engine light is on, and I'm failing emissions due to exhaust leaks and NOx catalyst issues. I suspect the NOx sensor might be bad, but I'm not totally sure. Has anyone dealt with similar symptoms? What did your mechanic find and how was it fixed? Looking for real experiences before taking it to the shop. Thanks in advance!

12 comment(s)

Quotation:
@CarlyMechanic wrote on
It's true that AdBlue can crystallize and potentially cause issues if it affects electrical connections. However, washing the engine bay can sometimes lead to water ingress in sensitive areas, which might cause further issues. If you decide to clean it, it's crucial to do so carefully. Consider using a gentle approach, like a damp cloth, to clean visible areas without soaking the components. If you're not comfortable doing this yourself, it might be best to have a professional handle it to avoid any accidental damage. Keep monitoring for any recurring issues, and feel free to ask if you have more questions!

Thank you for the answers. I heard there is a fuse for each NOx sensor. If so, where is it located in a 2017 X5?

(Translated from German)

Quotation:
@AndyL wrote on
Thank you for the answers. I heard there is a fuse for each NOx sensor. If so, where is it located in a 2017 X5?

The fuses for the NOx sensors in a 2017 BMW X5 are typically located in the fuse box. The main fuse box is usually found in the glove compartment or in the trunk area. To locate the specific fuse for the NOx sensors, you can refer to the fuse diagram provided in your vehicle's owner's manual or on the fuse box cover. If you're having trouble finding it, or if you're unsure about handling fuses, it might be best to consult a professional mechanic to ensure everything is checked and handled safely. Let me know if you have any further questions!

Join the discussion now: