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Regina Oxygen sensor testing 700 1990

uid 18083's pic
posted by  lucid on  Sun Apr 13 01:23 CST 2008
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last visit: Fri Oct 24 12:31 CST 2014
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"Today, after getting to work a little early, I grabbed a multimeter and measured the voltage on the black sensor lead. With the engine at idle it sat at .004V and did not move."

Sure sounds like a bad O2, if this was testing a warm engine with sensor in "closed loop" (connected to ECU).

The book says the signal "should vary between 0.1V and 1.2V. If consistently low, test it open loop (unplugged) and it "should after a while show approx. 1.2V."

If that 2nd test fails, don't immediately blame the sensor. My own experience (and reading here daily for 5 years) says that the Regina sensor is very long-lived. Maybe even more so than the Bosch type. So look for a break in the signal line. The 0.4V you saw closed loop could have been ECU voltage.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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