[2one3E90]

https://a.co/d/6C3QO1T

Also I need two of these for each bank right?

[lowrydr310]

That's only the part for the downstream (post-cat) rear (bank 2) sensor. You need one for each bank, but they're different parts. I'm not sure if it's just wire length or that and a different connector. The downstream front (bank 1) part is Bosch 16413.

I'm shopping for a front (bank 1) downstream sensor myself right now due to some codes. 2C7B (P0139), 2C9E (P0036), 2C7E (P114B), and 2C6B (P2270). There's a lot of oil on the connectors from a leaky oil pan gasket, and cleaning them didn't help so I'm replacing that sensor.


https://www.realoem.com/bmw/enUS/sho...diagId=18_0610

Bank 1 (front) downstream (post-cat): 11787545074
Bank 2 (rear) downstream (post-cat): 11787545075

[2one3E90]

Yeah I know there is 4. Two pre cat (which i replaced already) and now i got the codes back again, and the car sometime has no power or doesnt go over 1500 rpm. But sometimes it drives and revs fine to 7000rpm. So i was thinking will replacing the downstream 02 sensors fix it.

[Serf27]

The connectors are different for each one, but they do look like the ones linked in Amazon, not sure if the part number is for your car.

[mainbearing]

The Bosch 16414 is for Bank 2; 16413 is for Bank 1. I think the main difference is the wire color and lengths so less chance of mix up, but I think the sensors themselves are the same.

https://www.rockauto.com/en/catalog/...2)+sensor,5132

[lowrydr310]

Originally Posted by 2one3E90

Yeah I know there is 4. Two pre cat (which i replaced already) and now i got the codes back again, and the car sometime has no power or doesnt go over 1500 rpm. But sometimes it drives and revs fine to 7000rpm. So i was thinking will replacing the downstream 02 sensors fix it.

What codes are you getting?

[2one3E90]

Originally Posted by lowrydr310

i just updated my reply above, you need one for each side 16413 and 16414 if you're going with bosch.

What codes are you getting?

p0420 p0430.

[mainbearing]

Downstream sensors are only used for converter monitoring. If your car has no power sometimes it may be clogged converters. Then the P0420 and P0430 codes are for real.

Originally Posted by 2one3E90

Yeah I know there is 4. Two pre cat (which i replaced already) and now i got the codes back again, and the car sometime has no power or doesnt go over 1500 rpm. But sometimes it drives and revs fine to 7000rpm. So i was thinking will replacing the downstream 02 sensors fix it.

[lowrydr310]

Originally Posted by mainbearing

Downstream sensors are only used for converter monitoring. If your car has no power sometimes it may be clogged converters. Then the P0420 and P0430 codes are for real.

If that's the case it's time for some headers!