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Best investment if you do your own diagnostics is an OBDII reader.
Spend the $200 for a good one.
The one I bought has live data monitoring.
As far as 'Bank One' is concerned, there should be an O2 sensor before and after the cat.
The OBDII code should be specific.
After the exhaust is hot, you can compare the data to bank two and pinpoint the faulty sensor.
KT
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'74 914-6 2.6 SS #746
'01 Boxster
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