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victoriathunder1

Pathfinder exhaust back pressure sensor issue

I'm having trouble with my 2003 Nissan Pathfinder diesel. It's got about 157825 km on it. Recently, the warning light in the speedometer came on, and I've noticed quite a bit of smoke when accelerating. Also, it seems like the DPF isn't regenerating. After some research, I suspect it might be the exhaust back pressure sensor. Has anyone else experienced something similar?

Summary of the thread

A 2003 Nissan Pathfinder diesel with 157,825 km is experiencing a warning light on the speedometer, excessive smoke during acceleration, and a non-regenerating DPF. The suspected cause is the exhaust back pressure sensor. After checking connections and considering cleaning, replacing the sensor resolved the issue, restoring normal vehicle function.

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4 comment(s)

sophiahuber1

Hey there, I've got a Pathfinder too, though not sure about the year. Your symptoms sound very familiar. I had similar issues with the warning light and smoke, but not the DPF part. Did you check the sensor connections or try cleaning it before jumping to a replacement?

victoriathunder1 (community.author)

Thanks for the quick reply! I did check the connections, and they seem fine. I haven't tried cleaning the sensor itself, though. Was your issue definitely the exhaust back pressure sensor, and did replacing it solve the problem for you?

sophiahuber1

Yep, replacing the exhaust back pressure sensor completely resolved the issue for me. Given the smoke and the warning light, and the fact that you’ve already checked the connections, I'd say it’s highly likely that's your problem too. Although, since your DPF isn't regenerating either, it might be worth getting it checked out by a workshop to be 100% sure there isn't something else going on.

victoriathunder1 (community.author)

Thanks a lot for the advice! I really appreciate it. I took it to the workshop, and you were right – it was the exhaust back pressure sensor. Replacement cost me 245€. Everything's running smoothly now.

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NISSAN

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PATHFINDER