P0401 and P0402 codes
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From: Moyock
P0401 and P0402 codes
so my 96 2wd F150 5.0 throws either a excessive egr flow code or insuficient egr flow code periodically. lately it has been almost everyday i have to deal with this code. i just swapped the DPFE from a donor truck i have laying around and the light popped back on 30 miles later. im just not sure what it is. also tested the egr valve
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From: Moyock
are u talking about the vacuum lines going to the DPFE and the EGR valve? and no i havent ran any tests except pulling a vacuum on the EGR valve at idle and it bogged down, making me think the EGR valve is fine
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