Exhaust manifold temp sensor. - BMW M5 Forum and M6 Forums
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post #1 of 9 Old 20th April 2016, 03:07 AM Thread Starter
sunilshivaram
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Exhaust manifold temp sensor.

This is part no. 11 in the diagrams. My 2008 M5 doesn't have this part. It has a cap on it. Any idea why this was done ? Its a new car I bought from someone (and fails with Increased emission check engine). I am going through each part and figuring out whats missing and whats wrong.
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post #2 of 9 Old 20th April 2016, 03:14 AM
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post #3 of 9 Old 20th April 2016, 03:17 AM Thread Starter
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post #4 of 9 Old 20th April 2016, 03:18 AM
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Don't think that's missing or your problem because mines is the same way 2006 m6 capped off as well


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post #5 of 9 Old 20th April 2016, 04:44 AM
jcolley
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DME software change in very early versions changed to a modeled cat temperature and abandoned the EGT sensors.
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post #6 of 9 Old 20th April 2016, 05:02 AM Thread Starter
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I am looking at a picture of the exhaust manifold that was taken out of a 2007 M5. It has the temperature sensor, along with the O2 pre-cat and post-cat sensors. Mine is a 2008, and OBD2 scan (with Torque Pro and BT connection to OBD2 scanner) shows my Cat temperatures rise in increments of 15C every 5 seconds when I graph it while driving the car from a cold start. If the temperature of the cats can be a predictable behavior most of the times, it makes sense to model them into the software and get rid of the extra sensor.
I think what you meant was: the sensors were in the earlier (2006-2007) models and were removed in 2008 on wards (?).
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post #7 of 9 Old 20th April 2016, 05:27 AM
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The software was all that changed on the 06-07 cars, the sensors were left in place and not monitored. On vehicles produced after that, they stopped installing them. Unless your DME version is older than 140E, they aren't being actively monitored.
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post #8 of 9 Old 20th April 2016, 08:07 AM
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Quote:
Originally Posted by jcolley View Post
The software was all that changed on the 06-07 cars, the sensors were left in place and not monitored. On vehicles produced after that, they stopped installing them. Unless your DME version is older than 140E, they aren't being actively monitored.
Does any one know why they changed the software to ignore the sensors?
What problems were people having before the software change to ignore the sensors?
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post #9 of 9 Old 20th April 2016, 01:29 PM Thread Starter
sunilshivaram
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Quote:
Originally Posted by dr_dirtg View Post
Does any one know why they changed the software to ignore the sensors?
What problems were people having before the software change to ignore the sensors?
I think the catalytic converter temperature can be easily derived from the engine speed(fuel burned, and outside air temperature etc.), and would not have lot of variations, and predictable via computer software models. Its one less part I think.
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