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Tag Archives: P0171 troubleshooting

DIY maintenance, engine related

P0171 CEL 2005-2010 Scion tC system lean bank 1 – too much air

Posted on February 1, 2024January 16, 2026 by gen1scion

In this article I show you how to troubleshoot a P0171 System Too Lean Bank 1 CEL using a cheap smoke leak tester I bought from Amazon.

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Posted in DIY maintenance, engine related | Tagged P0171 troubleshooting, smoke testing system lean, system lean bank CEL

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