4 the ride
Active member
My 04 Z06 has a VaraRam cold air package. Recently I upgraded the air filter to their latest pleated and oiled replacement and in the process, I dry wiped some residue from the mass airflow body. I didn't touch the wire nor did I use any cleaners. Shortly after completing this upgrade I noticed some bucking when cruising in higher gears between 1,000 and 1,500 rpms. The car only has 15,000 miles and doesn't see much daily driving. Now the check engine light is illuminated. I stopped by a Advance Auto Parts store and they were kind enough to plug in an OBD2 reader and found that "bank 1" was indicating a lean condition. He explained that this was a reading from one of the O2 sensors. I have a set of Melrose Headers, Random Technologies high flow cats, an X-pipe and a Corsa cat back system. The work was done a number of years ago before I purchased the vehicle from it's original owner. When reviewing the receipts for this work, I noted that they installed a couple of O2 "simulators," when completing this work. Ok, having said the aforementioned can anyone help me with a potential cause for the illuminated check engine light? BTW, we cleared the code but it promptly returned within ten miles of driving. The car seems to run fine but.....what to do?