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bad O2 sensor?? 700

thanks for the tip - i will get my hands on an analog meter and test it this weekend - excuse the obvious but i am assuming that i am testing it while running?? which wires (two white, one black) should i be testing the voltage on??

25-29mpg is the ususal ballpark for the old girl - better in the warmer weather - she is a automatic too - i drive mostly highway back and forth to work everyday but even in the city she doesn't usually drop below 22-23 - and she has over 350k km on her now :) hopefully i can get this sorted and keep her roadworthy without too much expense
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90 740T wagon, 94 850 T5 wagon






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