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AN920

Oxygen Sensor Tester (Design Idea)

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My old car passed the emissions test. But when I drove away I floored it which left the testing place filled with too rich black smoke!


You have a diesel, right?  ;D

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You have a diesel, right?  ;D


No, I don't drive a stinky, noisy diesel. It was a '75 Volkswagen Rabbit. It was made for California with a deluxe catalytic converter that lasted only a couple of months. It frequently backfired which broke the catalytic and the mechanics did not know why. Sometimes it made black smoke and other times it backfired.

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There is a perfectly logical explanation for this: Volvo is since a few yers completely owned by Ford!  ;D

BTW, for the topic; Bob Blick has something to add about oxygen sensors here:

http://www.bobblick.com/techref/projects/o2sensor/o2sensor.html

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