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Old 08-11-2007, 01:37 PM   #1
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Default O2 Crossover Counts

It did a scan and I see I get from 0-2 of these. What does this value mean?
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Old 08-11-2007, 02:37 PM   #2
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This is the number of times per second the O2 sensor voltage values crosses from below to above the mid-range value (0.450v, equaling 14.7:1 A:F ratio). The PCM uses this O2 sensor value to calculate the proper amount of fuel to inject to keep the A:F ratio right.

As far as I know, that number should be around 30-40 (or higher). Yours is really tired and slow, and will lead to poor mileage (and possibly poor acceleration/throttle response). Sounds like it'* time for a new O2 sensor.
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Old 08-11-2007, 06:05 PM   #3
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Quote:
Originally Posted by agrazela
As far as I know, that number should be around 30-40 (or higher).
On previous scans it was 0 and car ran fine. Lately it'* been sucking up gas more than usual, but then again I've been disconnecting battery at least once a week as I have been doing misc. repairs.

Thanks! I thought 02 sensor is to blame but during the scan the O2 sensor goes from rich to lean often and the voltage from the o2 changes right in range.
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Old 08-13-2007, 10:37 PM   #4
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I ordered new 02 Sensor from Rock Auto. Thanks!
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Old 08-18-2007, 01:27 PM   #5
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O2 was shot. Not the best picture but it was covered in white ash.

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