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O2 ahead of cat is 0.04v at idle? OK?

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YOUR RESEARCHO2 ahead of cat is 0.04v at idle? OK?

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Adjust afr, the sensor is binary so hard

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Suggestion · Original poster
(From what I understand the oscillation is used to caluclate/adjust an AFR, the sensor is binary so hard to get good linear measurements)
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O2 ahead of cat is 0.04v at idle? OK?

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Leading evidence: 'Adjust afr, the sensor is binary so hard' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust afr, the sensor is binary so hard' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Adjust afr, the sensor is binary so hard

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion · Original poster
(From what I understand the oscillation is used to caluclate/adjust an AFR, the sensor is binary so hard to get good linear measurements)
Original post Read captured discussion
O2 ahead of cat is 0.04v at idle? OK?

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POST 1 / ORIGINAL POSTEROriginal post

Hi, At idle and no throttle the O2 sensor ahead of cat reads a steady 0.04v. As soon as I push the throttle a tiny bit it starts to oscillate as expected. Why doesn't it oscillate during idle? Doesn't it care about AFR during idle? (From what I understand the oscillation is used to caluclate/adjust an AFR, the sensor is binary so hard to get good linear measurements) Car is a 1999 996 3.4 cab

POST 2Original post

stuck lean? vacuum leak? what are you fuel trims at idle?

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 16024099

So it could be a scenario where the fuel trims are maxed out but still running lean? The FRA/TRA was 0.3 and 0.97 during idle. But I mixed them up, would have to go back and check to see what is what.

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