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Just because you have a check engine light, it does not mean that an O2 sensor is the only problem.
1123 and 1125 indicate you have a lean condition. Look for vacuum leaks. The OBD system on a boxster is VERY specific. If you have a bad O2 sensor, it will specifically tell you which one is in fact bad.
AFJ
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann.
Ihr Brunnen der nutzlosen Porsche Information
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