i bottomed out the other day (won't be the last time i'm sure), since then the check engine light came on with a code 154, no o2 sensor activity detected. i'm guess i either broke or loosend the sensor, but can't seem to find the location. anyone know where to find it?

 

There are 4 of them located on the exhaust. Placement depends on year of the boxster. 2 on each side.

 

thanks doc. i found them. the code says "bank 2, sensor 1". i'm assuming bank 2 is 3,4,5, and sensor 1 is before the converter? how do i know if it's a bad sensor?

 

btw, it's a 1999