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Discussion Starter #1 (Edited)
Are theese 2nd o2 sensors defective or do I already need a cat?

People usualy get this code with deleted cats and after market header.I'm stock with 96,xxx kms. Changed new filter,plugs,all fluids and now getting this cel.No other symptoms,same mpg ect.
 

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Yeah, my bet is on the sensor. Mine has been doing this off and on for quite a while now. Clear the code, see if it comes back. If it takes a while, probably the sensor.
 

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The sensor is done for. the slow response is the heater circuit slowly picking up after being revved or not picking up at all. replace the sensor and reset the code.
 
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