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Fuel line flush - BOGUS ?

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My daughter has a 2013 Outback with a 2017 four-cyl engine, which runs good and is reliable.

Her mechanic, who is newish to her, has recommended a "fuel line flush". I can understand a brake line flush, or a radiator flush - but I have never heard of a fuel line flush. It seems to me that is happening every time you drive. It sounds bogus to me, and fairly expensive. She did not say anything about a fuel filter, which should be changed periodically or as indicated by poor engine performance.

Is this guy trying to make a boat payment or what?

He is also recommending a oxygen sensor replacement in order to solve an engine code problem - which kind of points to the catalytic converter, but he thought he would start with the sensor. He quoted $600 for both services.

What does the hive mind think ?

Thanks,

Craig

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