|
Maybe they just accidentally left the primary o2 sensors unplugged or stressed a common connection between the two. Out of range tells me they're not reading anything, open circuit. Ive heard of stock tunes going 500 miles before throwing emissions codes on modified exhausts. Maybe it hasn't been good since the modification? Sometimes they ship x pipes with plugs in o2 sensor ports, make sure your installer didn't leave the o2 sensor out thinking the tune didn't need them..
|