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On my 2001 Pontiac Grand Prix GP, I have replaced the EGR valve still getting a P1404 code

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On my 2001 Pontiac Grand Prix GP, I have replaced the EGR valve still getting a P1404 code. What is the next step?

Vehicle: 2001 Pontiac Grand Prix GP

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Any restriction or carbon build up on the pintle.? Replace the EGR valve and retest
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P1404 PONTIAC Code - Exhaust Gas Recirculation Closed Position Performance
Read more: https://www.autocodes.com/p1404_pontiac.html

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