Question about 2004 Ford Fusion
It is usually the catalytic converter, but sometimes it is the oxygen sensor. If you have an volt/ohmmeter, you can check the sensor. Unfortunately I cannot access your wiring diagram, so I cannot tell you which terminals are which on the sensor. There are 4 pins in the plug. Check 2 at a time for resistance. When you find 2 that have a resistance of about 2-5 ohms, those are the heater terminals. Your sensor heater seems to be working. So, then you want to check the voltage on the other 2 terminals while someone revs the engine up and down. If you have more questions, please let me know. Here are testing instructions from autozone.com:
Posted on Oct 13, 2010
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Posted on Jan 02, 2017
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