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Via email, text message, or notification as you wait on our site.Ask follow up questions if you need to. The lean codes P0171 and P0174 (bank one and bank two) are usually set due to a vacuum leak or low fuel pressure. Take a close look at the PCV supply line for rotting out or leaking connection, this can set the code but not usually the hesitation.


Corrosion inside the sensor reduces its sensitivity to EGR flow, causing it to under-report EGR flow. The PCM responds by increasing EGR flow, which may keep the EGR valve open longer than usual creating a lean condition in the engine. An aftermarket replacement DPFE sensor costs less than $50 and usually gets rid of not only the P0401 code, but also the P0171 and P0174 codes, too.





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