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#1
05-17-2005, 09:28 AM
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Use of Oscilloscope to check for faulty O2 sensor...
I have high NOX from my emissions test on my 940 91 Turbo (not Mercedes; Volov, but the principle is the same) even though I recently replaced the CAT. I called the CAT OEM and they said "Check the O2 sensor"
I had recently replaced my O2 sensor with a Bosch Ford Mustang 92 GT O2 sensor, which everyone on the Volvo Forum says you can do, but the OEM says you can not. So I scoped it. I found an example waveform for a Volvo 940 Turbo below on the Internet. My scope output was pretty much the same, so I am confused as to whether the O2 sensor is at fault. Got any ideas? 
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