Does anyone know anything about the CEL caused by catless exhausts. Does the check engine light screw with anything because I know with the OBD II, a check engine light will mess with fuel/ air mixture and some other stuff and may end up damaging other sensors as it tries to compensate.
Does anyone know if a diagnostic is done on the STI and a hard code erase will get rid of the 02 code?

 

Thanks Dsmperformance. What kind of CEL fix is integrated into the DP? I heard that a mil eliminator won't work on the STI or 04 models. I talked to a different Subaru shop then the one I bought my STI at (of course) and they said that they can do a hard code erase on the 02 code and maybe that will get rid of the code. And he said he's going to do it for half the price of a regular diagnostic. Weird thing about the code is that it disables my cruise control. So I have a check engine light and the cruise control light flashes. That's what really bothers me. I'm gonna call TurboXS today.

 

RunRedLights, What is that CEL fix that comes with the DP. What does it look like and does it plug right in to the o2 sensor or something?

 

sounds a lot like a mil eliminator. Does your code make your cruise control light flash?

 

Alright people here's the DL. I don't know about any other DP but the TurboXS but I've talked to some other owners of STI's that have the TurboXS downpipe and they have the exact same problem. Even if you leave one cat on, the CEL will still pop up. The CEL with the Cruise control failure. Unplugging the battery for 7 minutes will reset the ECU and make the CEL go away for a limited time and that time depends on your STI. I went to the dealer and got a diagnostic and the only P-Code that came up was catalytic converter inefficiency. So I had them do a hard code erase and it ended up the same as if I reset the ECU. This code also makes the engine run super rich and makes the gas milage go to hell. ECU is trying to compensate for the catalytic converter inefficiency. "Word on the street" is that on the race pipe, cat pipe, or whatever pipe that has the bung for the o2 sensor can be modified to make the CEL go away. What they're doing now is extending the bung out about an inch to an inch and a half and it seems to make the o2 sensor chill. So what I'm saying is...if you take that pipe and weld a threaded bung about an inch long on top of the original bung then that will fix your dilema. Or you can wait a couple months and TurboXS and other companies will be selling the new product.