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lukechang
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I ran into secondary air system monitor incomplete issue past few weeks with my ‘01 996. I made many cold starts but failed to get it ready for smog check. I use a WiFi ODB reader with ODB Fusion app. It showed no fault code and no pending code every time I completed a drive cycle. At the end I decided to use my Foxwell N809 to check. It showed P1130 code. I cleared it and did a drive cycle (cold start idle 3 minutes, 20-30 mph 4 minutes, 40-60 mph 15 minutes). Everything cleared and ready except secondary air. I waited for engine cooled down and drove a around block neighbor immediately without cold start idle. The secondary air was then ready. The issue I noticed during this exercise is that ECM has a third place storing fault code for history in addition to the recorded code and pending code. Maybe it is a version before permanent code became official in recent years. Not all the scanners on the market are able to read it. I did a side by side comparison between WiFi ODB and Foxwell at the same time, only Foxwell showed code. With any hidden code in ECM, the secondary air would not complete.