[Empire087]

Just wanted to check, did catless downpipes on my car, and now i have a 2c9. Id assume it happened when i was banging the downpipes around with the sensors in them. Just to verify a 2c9f is bank 2 correct? So the rear most yellow oringed sensor? Want to make sure i order the correct replacement 02.

Also, ive heard that a failed rear can effect fuel economy. Is this true for our cars?

[Bimmer_Bro]

Originally Posted by Empire087

Just wanted to check, did catless downpipes on my car, and now i have a 2c9. Id assume it happened when i was banging the downpipes around with the sensors in them. Just to verify a 2c9f is bank 2 correct? So the rear most yellow oringed sensor? Want to make sure i order the correct replacement 02.

Also, ive heard that a failed rear can effect fuel economy. Is this true for our cars?

That is the cel from going catless. You need a tune that will delete that fault and keep the check engine light from going on.
You cannot go catless without a tune or fix. Are you using MHD?

[Dave92N54]

Originally Posted by Bimmer_Bro

That is the cel from going catless. You need a tune that will delete that fault and keep the check engine light from going on.

Are you sure? My shadow codes are 29F4 and 29F5

I thought those were the only ones thrown when doing downpipes

[Bimmer_Bro]

Originally Posted by Dave92N54

Are you sure? My shadow codes are 29F4 and 29F5

I thought those were the only ones thrown when doing downpipes

I could be wrong but I think the 2c9 code can be thrown from catless as well. Maybe another member can confirm.
Either way are you running MHD or a downpipe fix? Or are we talking catless downpipes with no tune?

[IllSic_Design]

Originally Posted by Bimmer_Bro

I could be wrong but I think the 2c9 code can be thrown from catless as well. Maybe another member can confirm.
Either way are you running MHD or a downpipe fix? Or are we talking catless downpipes with no tune?

catless down pipe codes are 29F4 and 29F5

[Bimmer_Bro]

Originally Posted by Empire087

Just wanted to check, did catless downpipes on my car, and now i have a 2c9. Id assume it happened when i was banging the downpipes around with the sensors in them. Just to verify a 2c9f is bank 2 correct? So the rear most yellow oringed sensor? Want to make sure i order the correct replacement 02.

Also, ive heard that a failed rear can effect fuel economy. Is this true for our cars?

Sorry I was wrong. After a quick google
Search, looks like the heater circuit on that o2 is damaged. You will need a new sensor.

[Empire087]

All good, i appreciate you looking out regardless. Biggest thing is wanting to verify that it is indeed the bank 2 sensor 2. Im also running mhd stage 2+ right now.

[IllSic_Design]

Yes, rear bank 2

[Empire087]

Originally Posted by IllSic_Design

Yes, rear bank 2

Solid, appreciate it!