You don't need to have a professional technician level scan tool (the scan tool in my photos is just a generic scan tool with Live Data).
Now, having said that, I've geared this article towards the person that owns a generic scan tool with Live Data capability Actron CP9580 Scan Tool). TIP 1: You'll need a scan tool (that has Live Data capability) to take advantage of my tips and suggestions in this article. You can find this tutorial in Spanish here: Cómo Probar: Códigos P0171 y In this article, I'll go into the basics of what causes these codes and I'll also offer you a testing strategy to successfully diagnose P0171 and P1074 diagnostic trouble codes. That's right, these two codes do not identify the oxygen sensors as bad. One of the biggest misconceptions, about these two diagnostic trouble codes, is that they accuse the oxygen sensors as being bad and this is just not true. This article will help you to diagnose diagnostic trouble codes P0171 (System Too Lean Bank 1) and/or P0174 (System Too Lean Bank 2).
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