SAI bypass solution for P0410

[rpaitich]

I may have a simple solution to tricking the SAI errors (P0410/P0411) on OBD2 993s, and would appreciate some info so that I can refine my idea.

As I understand, the SAI pump runs for a specific time (two mins?) and runs ONLY when the engine is below a certain temperature, like cold morning starts. The fuel mix is enriched to heat the CAT more quickly, thereby reducing emissions. After the specific run time, the SAI pump shuts off. If the SAI ports are clogged, the pump sees back pressure (or the O2 sensors show excessively rich) and you get the dreaded CEL P0410.

My idea is to trick the temp sensor, so that the SAI pump never comes on, and the SAI test is ignored by the computer. The minor downside is that the CAT won't heat up as fast. I'd do this every time the ignition is turned on, and trick the temp sensor to think the engine is at a temp above the temp that would turn the SAI on.

If you see a flaw in this thinking, let me know some details.

If this may work, someone please tell me where to find the temp sensor, and if you have the resistance values for cold and hot, let me know.

I'll be happy to post results of this when/if I get it working.

Ron