Hello fellow BoxsterFarians. I am stuck in Smog purgatory. Of the 5 "ready" attributes one will not come ready (which prevents California smog stations from being able to run a smog test). The attribute that is giving me trouble is the Secondary Air System test. When I started on this journey I had a few CEL codes that needed to be dealt with. I was throwing P0410 and P0411 as well as P1128 and P1130's. To add some excitement I was also getting P1115 codes occasionally. I tackled the P1115 error first. (Durametric translation - Porsche fault code 13 Heating Power O2S ahead of cat c bank 1). I swapped the two front (ahead) O2 sensors and drove it around a bit. Soon I had a similar error but it pointed to bank 2. So the error followed the sensor. I replaced that O2 sensor and the P1115 error is gone. Next was the P1128 and P1130 errors. Everything I read pointed to the Mass Airflow Sensor. Swapped that out, now all my errors are gone. Ready for Smog test right ? Well not so fast... Once the CEL codes are cleared, all 5 smog ready attributes change to the FAIL state. In order for the attributes to transition back to the PASS state one must drive the car through a cycle. There are tons of forum postings on what makes up a drive cycle so I won't go into that here. Long story short - I have driven through 4 controlled drive cycles and that pesky Secondary Air attribute will not change to pass. I have no other codes showing and things seem to be stuck. Some postings indicate that a weak O2 sensor can prevent the Secondary test from running to completion leaving one in Smog Purgatory. I have attached a Durametric log graph from my latest coldstart. (My Secondary Air pump appears to run fine and turns off after 60 seconds or so). If you look at the graph, the O2 sensor voltage AHEAD of cat (Bank 1 and Bank 2) appear to react differently during the time the air pump is running. Bank 1 (RED Graph) is the new O2 sensor. Bank 2 (BLUE Graph) is an O2 sensor that has not been changed. Should these two sensors track more closely? (as the two AFTER cat ones do ?) Could this difference in O2 Sensor performance be a cause of my Secondary Air test never finishing ? Would love to hear some opinions from this forum. Thank you, Frankyzambony Livermore California
