Hey guys, I was just wondering if a tune will clear the emissions codes that I get from my test pipes. Assuming my shop does not look under my car and only checks the Obd2, will a tune from uprev or ecutek keep the cel and codes from popping up?

 

It can. Basically what is going on is your downstream O2 sensors are seeing crazy emissions because no cats. A tune will reprogram the ECU to what it should be seeing and make it not throw a code.

However if they use a sniffer (edit: or even glance under the car), you will fail so fast.