I installed a Helix flex joint up-pipe on my 03 sedan, and cannot get the CEL to stay off. I have insterted a 2.2kohm resistor in the female end EGT plug on two seperate occasions, but the light still comes on after about 200 miles of driving. I am going to go get the code read today, but want to know where the port is for reading codes out of the ECU. IThanks in advance for your help

 

The diagnostic port is under the dash on the driver side, ahead of the steering column. Any shop with a scanner should be familiar with where it is (more or less same on all cars) and what it looks like.
If you've done the 2.2K resistor mod you shouldn't be getting EGT-related CELs so it may be something else. When you get it read post the code here if you need help figuring it out.

 

Thanks for your response Mulder. I'm sure a shop should know where the port is, I just wanted to know in case they didn't. That is exactly why I want to get the code read, to make sure that it isn't some other problem that I am ignoring because I think its the up-pipe mod. I'll search for the code when I get it and keep you posted. Thanks again!

Just for fun

:banana:

 

get an obdii 2 scanner, and get a code
when i instaleld my helix up and dp i had no problems at all

 

Okay, I got the code read on my way home tonight. As the subject says, it was a P0420 code. I did a search here and got mixed opinions on what it means. The scaner tool listed the code as a Catalyst Inefficency. I read a thread here that code P0456 is the proper code for low EGT's. So, does that mean that I need to add the rear 02 sensor fix? The only engine mods are the up-pipe and Cat back exhaust. Can anyone straighten out these codes for me? Thanks again.

 

Yes, a P0420 is a catalyst inefficiency code. If you still have the stock downpipe you shouldn't be getting this code unless there really is something wrong with the downpipe cat.
While a "fix" may take care of it the proper thing to do would be to have a dealer check the cat and if it's bad replace it under warranty. Depending on the particular dealer you may or may not have a problem because of the aftermarket uppipe.