In a message dated 96-05-29 11:13:34 EDT, raven@halcyon.com (Mark McCulley) writes: >I'm puzzled. Why does the Vanagon's O2 sensor need a heating element if it is >sitting in the catalytic converter which is quite hot? > > > The heater is needed to get the sensor up to operating temparature long before the exhaust gets hot enough. It also helps when the engine idles for long periods as the cooler exhaust at idle will often let the sesnor cool down too much for it to operate. With the digifant, it is extermely important that the sensor always gives a relaible signal. If the sensor output drops off, then the computer will continue to richen the mixture until the sinal returns. If the sensor works intermiaantly, then the mixture richening process will run away until there is no power and you actually get black soot out of the exhaust. Dennis.
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