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christopher_star1

Sienna Hybrid incorrect fuel composition error

My 2022 Toyota Sienna Hybrid with 163580 km keeps stalling and the check engine light is on. It's showing an error for "incorrect fuel composition", but I haven't used the wrong fuel. Any ideas?

Summary of the thread

A 2022 Toyota Sienna Hybrid is experiencing stalling and a check engine light due to an "incorrect fuel composition" error, despite using the correct fuel. The issue may stem from a defective cable or plug connection within the fuel system's sensor circuit. A professional diagnosis is recommended to identify and repair any loose connections or damaged wires, which was confirmed and resolved by a mechanic.

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4 comment(s)

marcomaier3

I had a similar experience with my Sienna. "Incorrect fuel composition" can be triggered by a defective cable or plug connection. Have you noticed any changes in your fuel economy recently? Also, does the engine knock?

christopher_star1 (community.author)

No knocking. The fuel economy does seem a bit off. What kind of "component" are you referring to? Is it something I can check myself?

marcomaier3

The component related to fuel composition is part of the fuel system. Given the error code and the stalling, a loose connection or a damaged wire in the fuel system's sensor circuit is probable. I recommend professional diagnosis and repair at a qualified workshop to prevent further damage.

christopher_star1 (community.author)

Thanks! My mechanic found a faulty connection, just like you said. Cost me 95€ to get it sorted. Glad it wasn't anything major!

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TOYOTA

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SIENNA