I bought the autoenginuity scanner over ebay a few years ago. It is MUCH better than the code readers and will give you readings for all the sensors and even do a diagnostic check on all the systems. You install it on a laptop computer and use the autoenginuity scanner on the volvo. For the oxygen sensors, it shows the readings and an ociloscope reading while the engine is running. The autoenginutiy site has a movie that you can download showing how it works. http://www.autoenginuity.com.
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1998 Volvo S70
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