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How do you fix trouble codes 171 or 174?

Updated: 10/5/2023
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Reubs

Lvl 1
6y ago

Best Answer

Both of those codes indicate the vehicle is running too lean. Most often this is caused by a dirty mass air flow sensor, located in the tube coming from your air cleaner. Cleaning with brake cleaner or electronics cleaner usually fixes it.

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9y ago
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