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Old 06-28-2012, 08:40 PM   #1
boltbustingtorq
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Default How to tell if 02 sensor should be replaced?

Are there tell-tale symptoms you can see in a data log that indicate the 02 sensors should be replaced? What are the typical issues / failure modes seen with 02 sensors?
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Old 06-30-2012, 01:31 AM   #2
Joe@Trick Tuners
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yeah. Bank to bank differences and a slow switching of the O2 volts in the logs. If they are bosch, then they are probably junk. Always buy motorcraft sensors!!!!! I've had at least 15 customers with bosch sensors that made their car run like crap and it was 100% cured with motorcraft sensors.
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Old 07-23-2012, 07:09 PM   #3
boltbustingtorq
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What would be considered "slow"?

Looking at my data log I see a high peak to high peak timing of ~1.4 to ~2 seconds -- is that too slow?

What is the expected high peak to high peak timing on brand new O2s?
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Old 07-24-2012, 12:03 AM   #4
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They should look like a nice wave pattern. If they stick at the top or bottom for longer than they should, they are probably bad. If the fuel trims don't correlate with the WO2, then they are probably bad. what symptoms do you have?
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