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AMM & O2 sensor checks 200 1986

posted by  darmstrong on  Sat Mar 8 02:55 CST 2003
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last visit: Sat Sep 13 12:21 CST 2014
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I tested some LH 2.2 component specs according to Bentley's and got the following:

Item spec my result

AMM heated wire 3.5-4 ohms 2.8 ohms
ambient impedance

oxygen sensor 0.4-1.0 volts .2 - .7 volts (Digital Multimeter)
voltage out

Also, manual suggested pulling oil dipstick should affect O2 sensor voltage, but I couldn't see an effect.


Is the low AMM reading typical of worn-out units, and does this definitely point to need for replacement?

Does low O2 output, or failure for dipstick pull to affect output indicate need for replacement of O2 sensor?








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AMM & O2 sensor checks 200 1986

posted by  Aye Roll on  Sat Mar 8 03:30 CST 2003
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last visit: Tue Oct 14 21:08 CST 2014
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It's really hard to say- it's close to the spec in each case. The real test would be to see how close the car is to emissions specs. If it's well within limits on HC and CO, then I wouldn't worry about it. However, if it's borderline or maybe even failing, I would plan on replacing the sensor. Supposedly they're only good for 30-50K miles.... I know lots of them keep working for 100K or even 200K. COuld be Bosch wants to sell more O2 sensors....
--
Rob Bareiss, New London CT ::: "Roterande Fläkt Och Drivremmar!"







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