[edevlin]

"Throw away the cheaters and ask edevelin how he resolved this issue. I think it took several months of trial and error but he did get it resolved. Good luck."

Try six months or so. I started out with a stock 2.7L Boxster and first put in a cold air intake and an Autothority chip and and the car was running great, no cel's. I decided to add headers and 100-cell cats and 4 new factory oxygen sensors to the car, and that is when the CEL's started up.

We played with extending the cables to the rear oxygen sensors, moved the sensors deeper into and out of the exhasut stream, moved sensor bungs along the exhaust stream, and more.

Ended up replacing 3 of the new oxygen sensors, both cats and as a final measure slightly reprogramming the threshold for triggering the oxygen sensor CEL in the ECU. The whole time the car was running great, it just kept giving CEL's. Even after all the hassle and expense, I still marvel at these engines, my little 2.7L just humms and last week it put out 210 hp to the wheels with 100-octane fuel, great fun

Ed

:dance: