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peterfischer1

Lexus CT200h Exhaust Leak

My 2013 Lexus CT200h hybrid is throwing codes. Check engine light is on, engine power feels reduced, and I'm burning more fuel than usual. I suspect a faulty exhaust temperature sensor. Has anyone else run into this?

Summary of the thread

A 2013 Lexus CT200h was experiencing reduced engine power, increased fuel consumption, and a check engine light, suspected to be due to a faulty exhaust temperature sensor. A suggestion was made to check for exhaust leaks, as a leak upstream of the sensor could cause incorrect readings and related issues. Upon inspection, a small crack in the exhaust manifold was found and repaired, along with replacing the faulty sensor, resolving the problem.

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4 comment(s)

simonschaefer2

I had a similar issue with my CT200h. Have you checked for any exhaust leaks? A leak upstream of the sensor can cause it to read incorrectly, triggering those symptoms. It messes with the emission control system.

peterfischer1 (community.author)

Thanks! I haven't specifically checked for leaks. Is there a common spot on the exhaust component where these cars tend to develop them? Or any way to easily check it?

simonschaefer2

On mine, it was a small crack near a weld on the exhaust manifold. Difficult to spot without a thorough inspection. Given your mileage, a failing exhaust sensor is plausible, but the leak would be my primary suspect. Best to get it smoke tested at a shop.

peterfischer1 (community.author)

Took it to the shop, and you were spot on! Small crack in the exhaust manifold, right where you described. Replaced the faulty exhaust sensor and fixed the leak; cost me 265€. Runs like new. Thanks for the help!

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LEXUS

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CT200H