[platinum_e90]

Does the secondary cat on a 2008 bmw 328i have an o2 sensor?

[Phyrexia]

No. First O2 sensor is on the manifold before the primary cats and the second O2 sensor is after the primary cats and before the secondaries.

[platinum_e90]

Originally Posted by Phyrexia

No. First O2 sensor is on the manifold before the primary cats and the second O2 sensor is after the primary cats and before the secondaries.

Thank you was thinking about doing the secondary cat delete just don't want it to throw codes

[shuotong]

No, and the secondary cats are EXCLUSIVE for USA/Canada models

[FIREWORKKS]

Originally Posted by shuotong

No, and the secondary cats are EXCLUSIVE for USA/Canada models

source?

[shuotong]

Originally Posted by FIREWORKKS

source?

There are simply no such things on Euro spec cars, as far as I know the emission rating of several states are the strictest in the world, second cats are similar to the carbon filter found in the N52 air box, they're pretty much useless.
It's already a EURO V emission rating car! How bad could it be? I personally against the catless thing because such exhaust probably produces 100 times more NOx/CO. But without secondary cats this car still satisfy EURO V which is a very strict standard already.

[W37V]

Originally Posted by shuotong

There are simply no such things on Euro spec cars, as far as I know the emission rating of several states are the strictest in the world, second cats are similar to the carbon filter found in the N52 air box, they're pretty much useless.
It's already a EURO V emission rating car! How bad could it be? I personally against the catless thing because such exhaust probably produces 100 times more NOx/CO. But without secondary cats this car still satisfy EURO V which is a very strict standard already.

n52 is euro 4.

https://de.wikipedia.org/wiki/BMW_N52

[shuotong]

Originally Posted by W37V

n52 is euro 4.

https://de.wikipedia.org/wiki/BMW_N52

It depends on the year, a 06 E90 is rated EURO III in China because they Euro IV is not introduced to China until 2008.
And also there are no Euro V E90 available in China, where an 2011 E90 330i in Europe is already EURO V, same reason as above.
It is is just a standard, it's a Euro IV car from the beginning but it's also capable to satisfy EURO V. The engine remains the same.