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Old 03-18-2014, 09:35 AM   #1
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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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Old 03-18-2014, 02:43 PM   #2
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Originally Posted by tdamlo View Post
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.
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Old 03-21-2014, 08:40 PM   #3
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Turned out that one of the pins had recessed in the connector
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Old 03-22-2014, 05:27 AM   #4
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Just goes to show the importance of good communication! :-)
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Old 03-22-2014, 08:45 AM   #5
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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.
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