emilnacht63
Sienna check engine light and fuel consumption
Summary of the thread
A 2020 Toyota Sienna owner experienced a check engine light, reduced engine power, and increased fuel consumption. The issue was suspected to be related to a faulty exhaust temperature sensor. Another person suggested checking for an exhaust system leak, which could affect sensor readings and engine performance. Upon inspection at a garage, a small crack in the exhaust manifold was found and repaired, resolving the problem.
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4 comment(s)
emilnacht63 (community.author)
A leak in the exhaust system, huh? That's a good shout. Where should I be looking specifically? Is there a common point of failure I should check first?
evafuchs5
Honestly, it's tough to say without getting under the car. It could be anywhere from the manifold to the tailpipe. Given the symptoms, and the fact that a leak could be the root cause, I'd suggest getting it checked out by a workshop. They'll have the equipment to properly diagnose it.
emilnacht63 (community.author)
Thanks for the advice! I took it to a local garage, and you were spot on. Turns out there was a small crack in the exhaust manifold causing the sensor to freak out. Cost me 265€ to get it welded up. Runs like new now!
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TOYOTA
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SIENNA
evafuchs5
Interesting. I had something similar happen with my Sienna. Is it possible you have a leak somewhere in your exhaust system? That can throw off the sensor readings and cause all sorts of problems with engine management and emissions.