I bought a 2002 GTP today test drove it 2 times in 2 weeks couldn't say a thing bad about it. About 30 on the highway SES light popped on I had my scanner so I plugged it in I got EGR low circ. code. I cleared it and drove another 30 miles no code. Ran to the store and left it running I come back to SES light and I thought for sure it would be the EGR but It was P0171 (lean condition bank one). Im stumped the EGR valve seems functional and from what I can carbon inst clogging it. The only problem I found was the bracket that holds the EGR tube to the mount were your EGR valve goes was missing a bolt. Could that small leak cause my problems EGR included?