Finally replaced all 4 O2 sensors w/ generics for $160.

[MNBoxster]

Originally Posted by fab

Ohioboxster, are you sure?
I thought P1117 code refers to the Precatalyst oxgen sensor. This infomation is from Bentley Service Manual.

MNBoxster you must like to type alot, unless you like using copy/paste.
thanks for the lenghty email but what you wrote how does that answer my question.

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How can you tell out of the which sensor needs to be replaced?

Hi,

You have a 2.7 e-gas Boxster while OHBoxster has the 2.5 non-e-gas model. Different code definitions for each.

But, a Bad O² sensor can throw one of many codes, usually all related to AF Mix, ECU, or actual O² sensor.

If you read my reply, and if your Boxster has 30k+ mi. on it, you'd see that you need to replace all the sensors, not just the one which is showing itself to be faulty at present. These have a Service Interval which is mileage dependent (30k mi. according to Robert Bosch, AG), just like your Oil & Filter, and they all have been in service the same amount of time/#miles .

You should replace them all at once. Not doing so may lead to no improvement in performance/range/emissions (you might not even feel a difference, but the DME may not be selecting the optimal Maps for your car/gas/driving conditions). And, you'll most likely be starting down a path where the other three require attention in short order...

Happy Motoring!... Jim'99