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oxygen sensor error code- which one is it?

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Hey All, I have a 2003 cayenne S, and am getting durametric error code p0030. I have been able to find out that it is HO2S - oxygen sensor heating output stage ahead of TWC Bank 1.

My question - which O2 sensor needs replaced? where is ist? what is TWC? And is BAnk 1 drivers or passenger side.

Also, on a different topic - I have had an issue with the following warning on start up - gives me the "!" but sets no durametric codes - and my dash displays tlells me to "check headlight beam adjustment" I have done this as per the manual, but just can't get it to quit beeping at me on start up - any help on what I am missing or how to reset this would be great


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LHD cars: bank1 = passengers side

TWC: three way catalyst

The problem sensor is located in front of the cat, bank1, passengers side.

The headlight issue is probably due by the build in servo motor, better use a PIWIS tester to do some tests and pinpoint the problem.

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