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Try cleaning the MAF with a can of elecrical cleaner. then clear the code with a OBD11 tester.

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โˆ™ 2006-11-13 19:47:46
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Q: What would be the cause of Engine code PO171 on 1999 Toyota 4-runner v-6 limited?
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1999 Toyota 4 runner limited PO171 came up changed upstream sensor still check engine light came back on any reasons for this?

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