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Discussion Starter · #1 ·
I just pulled the following codes. I have gutted cats, and I haven't gotten around to MIL eliminators...

P0401 EGR flo insuf
P0420 Cat 1 Eff below threshold
P0430 Cat 2 eff below threshold
P0171 Lean 1
P0174 Lean 2

Now I realize that the 2 cat related ones are *most likely* from my gutted cats, so I will Fix that with the Eliminator
According to my search results, the Lean 1 & 2 are detected before all of that, sooo......

And then on the EGR, perhaps I have a bad DPFE?

Mostly I am concerned about the lean codes. What might be causing these?

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