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Bosch sensors for these cars do not work as well as the NTK ones; they were the oem. I went thru a few of the bosch ones, and they were especially sensetive to contaminants.
 

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I'd look elsewhere for the problem, personally. the way they are switching, I think they're ok.
Bad o2's go to a voltage and stay there.The reading the computer uses is an average.
 

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The heater codes were bad o2 sensors on Lazarus. One of the rear ones shorted it took them all out.
 

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Check for vacuum leaks.
 
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