First, some backround info on my car:
97 Cobra, ~50k miles, recently tuned up. All factory o2 sensors are in perfect working order. Mechanically the car is in good shape.
About a month or two ago, I ordered from UPR their offroad X-pipe and a set of those "Dallas" $60 plug-in MIL eliminators. Going through the procedure perfectly, unplugging the battery before doing the install, I hooked up the pipe and plugged in the MIL eliminators. CEL was off for about a day, then came back on. After repeated attempts to fix this, even going to a shop to run codes, the only error code that came back was "rear o2 sensor malfunction". So he used the device that tapped into my ECU to clear the codes, and I went about my merry way. The next day, the light comes back on. So I unhook the battery, and switch the plug ins around, just to make sure everything is fine. Next day, light comes back on.
So a couple weeks ago, I sent those plug ins back to UPR. They sent me a brand new set within the next couple days. I unhook the battery, hook them in, zip tie them out of harms way, and sure enough my light is now back on.
I am at my wits end with these things, and am now a disbeliever in them. My sensors are fine, they were working perfectly and I had no check engine light prior to installing the x-pipe/plug ins. A dedicated Mustang shop that I took my car to to get my gears installed told me that the mil eliminators are worthless on most Stangs and the only true way to get rid of the light is to get a chip to shut it off.
So I guess this message is a warning to those debating on weither or not to get the plug ins. I have had NO luck after 2 sets of the expensive plug ins and numorous attempts to fix the problem. IMO they are worthless.
97 Cobra, ~50k miles, recently tuned up. All factory o2 sensors are in perfect working order. Mechanically the car is in good shape.
About a month or two ago, I ordered from UPR their offroad X-pipe and a set of those "Dallas" $60 plug-in MIL eliminators. Going through the procedure perfectly, unplugging the battery before doing the install, I hooked up the pipe and plugged in the MIL eliminators. CEL was off for about a day, then came back on. After repeated attempts to fix this, even going to a shop to run codes, the only error code that came back was "rear o2 sensor malfunction". So he used the device that tapped into my ECU to clear the codes, and I went about my merry way. The next day, the light comes back on. So I unhook the battery, and switch the plug ins around, just to make sure everything is fine. Next day, light comes back on.
So a couple weeks ago, I sent those plug ins back to UPR. They sent me a brand new set within the next couple days. I unhook the battery, hook them in, zip tie them out of harms way, and sure enough my light is now back on.
I am at my wits end with these things, and am now a disbeliever in them. My sensors are fine, they were working perfectly and I had no check engine light prior to installing the x-pipe/plug ins. A dedicated Mustang shop that I took my car to to get my gears installed told me that the mil eliminators are worthless on most Stangs and the only true way to get rid of the light is to get a chip to shut it off.
So I guess this message is a warning to those debating on weither or not to get the plug ins. I have had NO luck after 2 sets of the expensive plug ins and numorous attempts to fix the problem. IMO they are worthless.
