luiseloewe1
i20 Exhaust Temperature Sensor Issue
Summary of the thread
The check engine light on a 2011 Hyundai i20 diesel indicated an issue with the exhaust temperature sensor, leading to sluggish performance and increased fuel consumption. A similar problem was resolved in another vehicle by identifying a small leak in the exhaust system that caused faulty sensor readings. The recommended solution involved a professional inspection, such as a smoke test, to locate and repair the leak, which in this case was a crack in the exhaust manifold. Repairing the crack and replacing the sensor resolved the issue.
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4 comment(s)
luiseloewe1 (community.author)
So, the leak caused the sensor to give faulty readings? Was it difficult to pinpoint the exact location of the leak? What did you have to do to fix it?
leoniesky7
Yes, the leak led to wild temperature fluctuations, which the sensor dutifully reported. I couldn't find the leak myself, so I took it to a workshop. They smoke-tested the exhaust to find the crack. Best to get it checked out, as driving with it could damage other components.
luiseloewe1 (community.author)
I appreciate the advice. Took it to the local garage, and it turns out you were spot on. There was a small crack in the exhaust manifold, right before the sensor. The repair cost 265€, including the sensor replacement. All is good now!
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HYUNDAI
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I20
leoniesky7
Sounds familiar. I had a similar problem with my old Opel Astra after around 160000 km. The engine management light was on constantly, and performance dipped noticeably. In my case, it turned out that a small leak in the exhaust system was messing with the sensor readings. It's like trying to measure the temperature of soup with a cracked thermometer - the reading goes all over the place.