Check Engine Light Help

First off, thanks for all the good advice from all the members here.

Now to get to it. After purchasing my 2011 Tacoma, I immediately installed a AFE Stage 2 CAI and a Dynomax Cat Cack. I knew these two mods would cause the check engine light to come on, so I wasn't worried. I learned that the URD MAF Calibrator would fix it, so I ordered one and installed it earlier in the week. The check engine light stayed off for a couple days, which would make sense since I disconnected the battery, but it came on again this morning. I plan to check and clean the MAF sensor tonight, but what else should I check? I assumed the MAF calibrator would have helped the light stay off, but.... Maybe the O2 sensor because of the cat back? I know I need to get the codes read, but that'll have to wait until tomorrow or the weekend, but was hoping to check some things out in the mean time. Any advice would be appreciated.
Chris

 

i wouldnt do anything until i knew what codes its throwing. it might be something totaly different from what youre thinking

 

pointless to guess, get the codes pulled and go from there

 

Get a $30 obdII reader.

http://cgi.ebay.com/ebaymotors/U380...tive_Tools&hash=item3a68d651ff#ht_3618wt_1165

 

Ok, so I went out and bought a ODBII reader. It is throwing a P0465 code, which according to the little book means "EVAP Emission Purge Flow Sensor Circuit Malfunction." And now I'm lost...please help.

 

Thanks. Dealer is three hours away, not that simple. Just trying to figure out if its something simple or not. Could be gas cap..checking that now.

 

Sorry, the code it actually P0456, then another code that indicates the P0456p/d, meaning pending. This is my first experience with the OBDII reader. I'll try erasing the codes and see if they come back.

 

Pull the gas cap and inspect. Re-tighten firmly. Reset and check.