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03-18-2021, 07:41 PM | #1 |
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Drive cycles needed to set emission SMOG readiness check - hot O2 check
I cannot get the final SMOG readiness check to swap over to "ready." It's the "H O2" or O2 heater (or hot O2?). I've done 3 different drives for a combined 150 miles or so.
I've recently swapped headers and have had no codes or other issues. All of the others are set to "ready." Any ideas?
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His: 07 Z4 M Coupe - 05 330i ZHP
Hers: 04 330i ZSP Sold: 04 325i M56 SULEV, 95 NA Miata |
03-21-2021, 08:40 PM | #2 |
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This is my guess/ intuition. More drives (they can be short distance) are needed. I say this because oxygen sensor heaters are all about getting the sensors up to temp quickly when the engine/exhaust stream is not hot enough.
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03-22-2021, 06:54 PM | #3 |
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I got it to set to "ready" today.
Somewhere else somebody said to follow these steps:
I followed that precisely, except for the 10-15 minute part; it was closer to 60-70 minutes. One note: I didn't turn on any interior or exterior lights. Also, a lot of these guides say you need 35-85% fuel capacity. That might be for some test, but I started this one at 95+%. Reborn_, after reading a few items this weekend, I agree with your statement. I think the first bit of my process is what worked. Thanks
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His: 07 Z4 M Coupe - 05 330i ZHP
Hers: 04 330i ZSP Sold: 04 325i M56 SULEV, 95 NA Miata Last edited by stephenkirsh; 03-22-2021 at 11:33 PM.. |
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03-25-2021, 12:47 PM | #4 |
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What headers did you swap to? 02 sensors new or swapped over? If the exhaust set up is different then OEM where are your sensors located?
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03-25-2021, 12:56 PM | #5 |
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I removed catless headers and put the original OEM ones on. Everything on the car is currently stock.
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His: 07 Z4 M Coupe - 05 330i ZHP
Hers: 04 330i ZSP Sold: 04 325i M56 SULEV, 95 NA Miata |
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