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Old 11-20-2012, 08:29 AM   #1
redbull 325is
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o2 heater & secondary air readiness not setting

Hey,
Been trying to get both of these to set for a while. I let the car idle for about 2-3mins (Ie: when the pump is running) during cold start up, but it still won't set. No fault codes whatsoever (checking with ediabas).

Back story: put headers on, left rear o2 sensors in drug bin, car set readiness with no issues other than cat efficieny/o2 readiness. Then I tried an o2 sim, reset my cel and since then the sec air & heaters won't pass. Even got new sport cats installed, car now even passes cat monitoring. I checked both rear o2s' resistance, which were both around 3 ohms iirc.

Could one of my front o2 heaters be on the way out but not setting a light yet?
What conditions have to be met for the car to set secondary air & o2 heater? (I looked in my bentley and in that ms43 pdf but found nothing specific)

Thanks!
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Old 11-20-2012, 08:49 AM   #2
jfoj
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Single start and idling will not help you clear readiness codes.

Given you have headers, you may have some challenges!
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Old 11-20-2012, 10:34 AM   #3
redbull 325is
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Quote:
Originally Posted by jfoj View Post
Single start and idling will not help you clear readiness codes.

Given you have headers, you may have some challenges!
can you elaborate? I thought secondary air passed at idle on cold startup. It has passed previously with the headers. *shrug*
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Old 11-20-2012, 12:22 PM   #4
jfoj
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Originally Posted by redbull 325is View Post
can you elaborate? I thought secondary air passed at idle on cold startup. It has passed previously with the headers. *shrug*
Kind of. Depends on a lot of factors and how the DME software is programmed. Sometimes it take only 1 or a few starts to clear a System Readiness code, then sometimes if you trigger a code for something, clear the codes, the the DME/ECU can delay the System Readiness code clearing for a much longer count to make sure the problem has actually been repaired and is not going to come back quickly.

I have not specific insight into this on the BMW, however, I have personally witnessed this on many other cars.

This is to keep people from clearing codes, running to get car inspected just before the fault triggers again.

Last car I had the SAP hose break on, triggered a SAP code, I repaired the hose, cleared the codes and it must have taken 15-20 SAP cycles before the Readiness Monitor finally cleared.

If you are trying to get an emission inspection, check your state guidelines, many states will allow up to 2 Readiness codes to not be set and pass as long as the CEL is not lit for another problem.
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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