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Originally Posted by BigRedChevy  EGR codes P0401 and a P0404 are the ones that the blocker plate and no cat causes. If you are running the predator then it will block the codes and they won't come in. |
Do you hae any idea what these codes are indicate. On my road trip I had these codes come on and I wasn't sure what they were, especially with no tuner yet. So I took it to a dealership and they put it on the computer and told me that I had restriction on the fuel. They suggested a fuel filter change. I will never let the dealership change another fuel filter that is for sure. $34.95 for the filter and $96 labor for a 30 minute job.
They did tell me that the fuel filter was pulling 6 inches vacuum instead of the 9 that is needed. I was 600 miles from home so I just went with it because i noticed that my mileage went from about 20 to between 15 and 18 before the filter. I haven't filled up to calculate the mileage after filter change.