oliver_kaiser1
Sail diesel exhaust back pressure sensor issue
Summary of the thread
A 2012 Chevrolet Sail diesel exhibited a warning light, excessive smoke during acceleration, and failure to perform DPF regeneration, leading to suspicion of an exhaust back pressure sensor issue. The problem was potentially linked to a faulty sensor, with advice to check the sensor's wiring and connectors for damage or corrosion. Ultimately, a professional diagnosis confirmed the sensor issue, and its replacement resolved the problem, restoring the car's performance.
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4 comment(s)
oliver_kaiser1 (community.author)
Thanks for that advice. I haven't checked the wiring specifically, but I visually inspected the sensor and didn't see anything obvious. Where exactly should I test with the multimeter, and what readings should I be expecting from a good sensor?
detlef_lion80
Without the specific Sail diesel wiring diagram or your sensor's specs, giving exact readings is tricky. It gets more technical here, and honestly, messing with it more could cause further damage. Given the DPF issue as well, I would advise a professional shop to properly diagnose and replace that sensor.
oliver_kaiser1 (community.author)
Okay, thanks for the advice. I took it to my local workshop and asked them to check the exhaust back pressure sensor. They replaced it, and the total bill was 245€. Car is running smoothly again.
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CHEVROLET
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SAIL
detlef_lion80
Sounds like the exhaust back pressure sensor is a likely culprit, especially with those symptoms. I remember a similar issue with my old Opel Astra, turned out to be a faulty sensor. Have you checked the sensor wiring and connectors for any damage or corrosion? A multimeter could help you confirm if the sensor is sending the correct signal.