Drive cycles needed to set emission SMOG readiness check - hot O2 check

[stephenkirsh]

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?

[Reborn_]

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.

[stephenkirsh]

I got it to set to "ready" today.

Somewhere else somebody said to follow these steps:

• Turn on the car from cold
• Let the idle come down to normal, then turn on all electronics:
• A/C, seat heaters, radio, defroster
• Idle for 2.5 minutes
• Then drive for 10-15 minutes

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

[F360C]

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?

[stephenkirsh]

Originally Posted by F360C

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?

I removed catless headers and put the original OEM ones on. Everything on the car is currently stock.