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O2 heating time?

Old 04-16-2019, 05:17 PM
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O2 heating time?

How long does it take for an O2 sensor to heat up? I get a trouble light on cold start, but not on restart after 20 seconds. Is this sensor the culprit?
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Old 04-16-2019, 06:07 PM
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Re: O2 heating time?

The o2 has to reach 5-600f to become active.
the engine would be about 160-200f for this to happen unless you have a heated o2.
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Old 04-16-2019, 06:19 PM
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Re: O2 heating time?

Originally Posted by Tuned Performance View Post
The o2 has to reach 5-600f to become active.
the engine would be about 160-200f for this to happen unless you have a heated o2.
Thank you.

do have a heated 02 sensor, but also a three-row radiator which doesn't reach 160F until I've driven four or five miles.
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Old 04-16-2019, 07:08 PM
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Re: O2 heating time?

In a lot of gm ecm calibrations the engine won’t enter into closed loop until 160f or higher.
Any trouble codes with your mil ?
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Old 04-16-2019, 09:52 PM
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Re: O2 heating time?

If you've ever driven/ridden in a car with old Christmas tree twinkle light style AFR gauge hooked up to a narrowband O2, you may have noticed on a cold start the twinkly lights kind of stick, or flicker between one-to-three segments of the bar of LEDs. It'll sit with that couple bars lit and won't move much until the engine has been running awhile. After it warms up, the resistance starts to cycle and the gauge starts wiggin out from the rich to lean side, that's about the only easy way I can tell when the O2 comes up to temp. As you can imagine, a cold start on a winter morning or night, it takes a lot longer to come up to temp, compared to a warm start in August. There's no right/wrong time limit.

That said it shouldn't matter. The ECM doesn't care if its a heated o2 or not, one just heats up faster, the signal to the ECM is identical it's just the heated O2 starts cycling faster.

Don't go with guess work. Pull the code. Get the code definition and troubleshooting pages from the manual for your setup, and follow the diagnostic steps/flow chart. Doubt it is the cause of the problem, the hot/cold start difference is just a symptom of whatever problem you have. The code, and charts for isolating it's causes will lead you to the problem by taking you down a path marked with breadcrumbs, eliminating possibilities in a logical manner, until the issue is resolved.... Usually.
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Old 04-17-2019, 06:10 PM
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Re: O2 heating time?

Rather than fast heating when cold, isn't the main benefit of a heated O2 to keep the sensor at operating temp even during a prolonged idle? So you aren't cycling back and forth between open and closed loop?
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