[Dale_K]

I received the Durametric I ordered from Pelican and now I have some actual data about my car, a 2000 S Tiptronic that has been giving me codes about running lean (1126 and 0410 most recently).

I also bought the ODBII maintenance manual which tells me the Porsche terminology for running lean - "Oxygen sensor adaptation range 2 (cylinders 4-6) enrichment limit". I found some data points in the Durametric pull-down list of actual values. I cleared the codes and took a 30 mile drive last evening. I tried to take a long log file but it apparantly stopped soon after I departed so I obtained the following values while idling in my driveway after the drive. At that point the car showed no fault codes and seemed to be running perfectly. Typically the codes return within 200 - 350 miles. Here are the numbers...

Loss adaptation idle =.08
Adaptation range 2 FRA Bank 1 =1.27
Adaptation range 1 RKAT Bank 1 =-2.58
Adaptation range 2 FRA Bank 1 =1.24
Adaptation range 1 RKAT Bank 2 = -2.39
MAF voltage at idle =1.30

Are these the right points for monitoring fuel trim?
What do "range 1" and "range 2" mean?
Waht do "FRA" and "RKAT" mean?
What are the units of measurement?
How do I interpret the numbers (what do perfectly running motors show)?

What would be the best strategy to employ the Durametric as I proceed with repairs to this car? I have had a local shop smoke test the vacuum and have a replacement vacuum line to the brake booster on order. I can see that the Durametric will come in handy if I decide but buy a fuel pressure test gauge but is there any value in activating the evap valve or the secondary air injection to see if the fuel values change? Or would those activations be useful if I need another smoke test?