[KevinH1990]

Thanks

I have already cleared the codes and I will see whether they return.

I checked my records (I also have the records of the previous owner) and I have only had to replace one O2 sensor during the life of the car. That was for a P1117 code - the O2 sensor after the cat on the passenger/right side of the car in 2007. I suppose it's possible that the two that set fault codes are just reaching the end of their service life at the same time. However, that seems like a low probability event.

The only unusual event is that I have been driving the car back and forth to work more than I usually do because I am having a problem with the alternator on my other car. However, the Boxster is not a garage queen and I drive it year round.