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I had no check engine light on but had codes ran anywas and got po171 so I changed the front o2 sensor and it's still backfiring a few months back had a tune up I was wondering what it could be thanks

Vehicle: Dodge Dakota 1997

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P0171 Fuel trim lean bank 1

What you have is a lean misfire,The 02 sensor are just reporting the condition, what you need check fuel pressure , the specification at idle should be at 49 psi. Recheck the sparkplug wire condition and the cap and rotor ,replace if necessary

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