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Originally Posted by Duke2.6
Everytime the flux field is interrupted by the flywheel segments, the pickup produces a small voltage. The input impedance to the EZL is high, but not infinite, so a slight amount or current and thus, energy, is transfered and this will eventually consume the pickup's magnetic flux.
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Like I said, it will degrade about 1%, so it's not bad even after 10 years.
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Originally Posted by Duke2.6
A scope can be used to monitor the output voltage wave form of the 02 sensor, and given the cost of an O2 sensor, I believe they should be tested rather than replaced, apriori.
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Originally Posted by taboo
1989 W124 wagon, 220K . . . .Car has original O2 sensor
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It's the original O2 sensor and if there's EVER a sensor that needs to be replaced, it is that one. As I've said before, Bosch rates them to 60k miles but at
220k miles, it SHOULD be replaced! No questions asked!
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Originally Posted by Duke2.6
I've never tested my CPS because I have no reason to suspect it may be faulty, but I have inspected the output waveform of my O2 sensor.
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A CPS can be easily tested, at least to a first order, by using an ohmmeter; should measure about 800- 900 ohms. So it does, it probably is good. It's nothing more than a passive magnetic amplifier consisting of a coil of wire around magnetic material. Certainly a scope is the much better test but as I said, I NEVER seen one go bad in normal engine usage especially in the older Mercedes.