P0171 - lean burn on bank 1
P0174 - lean burn on bank 2
P01472- purge valve blocked

I've reset the service engine soon light but it always comes back on in a few minutes. I do not hear any unusual engine noises, gas mileage seems to be about the same around 20MPG on the highway and there doesnt seem to be any power lose. I have replaced some of the vacumn hoses and I cannot find any leaks anywhere. 2002 HSE, 74,000 miles and has given very little trouble up to this point. Any ideas on what the problem is and how to repair it?? Thanks

 

Until you fix the problems, there is no since in trying to clear the codes, your ECU is trying to tell you something. The evap code has nothing to do with the lean codes, could be the beginning of a MAF failing or a major vacuum leak.

 

I did find a couple of vacuum leaks but still had lean burn error codes. A new mass air flow sensor cleared them up.

 

I have a question about the secondary air inlet (upper intake manifold), does this need to be block if there is no secondary air installed? Mine has a piece of broken rubber on in, like there was once something installed but there is definitely nothing installed now, would this cause the lean codes?