P0140 cel
 

I have a 97 boxster base 2.5 and I just got a p0140 cel indicating oxygen sensor after catalytic converter(cylinders 1-3) interruption of signal. I recently replaced my clutch, coolant overflow, and added a topspeed exhaust. From what I have read on the forums that code typically refers to a bad connection not a bad oxygen sensor. What is the proper method for testing an oxygen sensor and related wiring? Which side of the car are cylinders 1-3?


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Cylinders 1-3 are on the right side of the car. Swap the O2 sensors and see if the code changes to the other bank.

Turned out that one of the pins had recessed in the connector

Just goes to show the importance of good communication! :-)

I got the same code when I switch to the top speed exhaust. I got it on my first hard blast down the autobahn. I reset the code and it went away and never came back. I chalked it up to being a change in exhaust flow and the dmd needed to adapted... might be talking out my ass but i am taking my theory and running with it.