70% koeo means US non calif system and all is well at that point. However, the fixed reading at temp is wrong unless the car is overly rich. 10% is very rich but not fluctuating is wierd. I thought the reading was meant to be read at koeo. Steve any ideas?
Have you checked your EHA numbers?
m

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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)