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What can be cause of fault code p0172?

Updated: 12/13/2022
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14y ago

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In my 98 Saturn SW2, P0172, system too rich, was caused by a bad engine coolant temp sensor. This is a common failure in these vehicles.It's cheap and easy to replace, and worth trying. When you take it out, if it's the original, it will be cracked. The new ones are metal. It takes a 13mm deep socket.

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14y ago
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Q: What can be cause of fault code p0172?
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