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Trouble Codes on 2004 Nissan Altima

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I did a diagnostic on my car and came up with three trouble codes. PO430 and PO340 & PO340 p/d. Please help.
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These codes refer to the following: P0171 system to lean bank 1
P0174 system to lean bank 2
Hope this helps.
Hi Katt,PO430 means Catalyst System Efficiency Below Threshold, PO340 means Camshaft Position Sensor "A" Circuit. And I know some DIY tool, maybe they can help u.