Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** almost always means the converter is problem and it is pretty hard to test without a scan tool. Monitor the front and rear oxygen sensors while driving at a steady cruise. If the front O2 sensor is operating normally (switching rapidly 0.1 to 0.9 volts) and has a good pattern, then look for the rear O2 sensor to be steady and not switch rich to lean. It is the job of the catalytic converter to use up the oxygen to clean up the emissions. So, if the rear O2 sensor switches like the front one, the catalytic converter is bad and will need to be replaced. If you do not have a scan tool to monitor sensors you can try running long wire from o2 sensor signal wire to monitor voltage too. Let me know if you have more questions or if there is anything else I can do to help. Thanks.
If you can monitor oxygen sensor voltages on scan tool it should work fine and I think it probably will give the voltages to both. Let me know how it goes or if you run into more questions. Thanks.
No problem, keep me updated. Thanks again and have a good weekend!
Because oxygen sensor isn't being clear about converter having failed oxygen sensor would be place to start but converter is still the most likely cause. Let me know how it goes, thanks.