[SameerG]

Hey guys, i have a 340xi and have a jb4 and catless dp. Im having a cel light in the dash but im on map 2. Don't understand why. Any recommendations on what to do?

[Mike@N54Tuning.com]

Originally Posted by SameerG

Hey guys, i have a 340xi and have a jb4 and catless dp. Im having a cel light in the dash but im on map 2. Don't understand why. Any recommendations on what to do?

Read the codes. Maybe just a downpipe detected fault.

Mike

[SameerG]

Originally Posted by Mike@N54Tuning.com

Read the codes. Maybe just a downpipe detected fault.

Mike

Thank you ill get on that now

[HitmanHearns]

Originally Posted by Mike@N54Tuning.com

Read the codes. Maybe just a downpipe detected fault.

Mike

Yeah, chances are it’s the downpipe. For me any drive that’s about 25-35 miles straight triggers the CEL. It’s not a big deal though, jb4 Bluetooth/app allows you to clear it in seconds, very convenient.

[SameerG]

Originally Posted by HitmanHearns

Yeah, chances are itÂ’s the downpipe. For me any drive thatÂ’s about 25-35 miles straight triggers the CEL. ItÂ’s not a big deal though, jb4 Bluetooth/app allows you to clear it in seconds, very convenient.

Thank you i was reading upon that and am considering to buying that

[Frank Jia]

Actually BMS jb4 officially doesnt recommend any Catless Downpipe on any B58 motor until flashTune available. It will cause terrible tune problems.

[G.Newt]

Originally Posted by HitmanHearns

Yeah, chances are it’s the downpipe. For me any drive that’s about 25-35 miles straight triggers the CEL. It’s not a big deal though, jb4 Bluetooth/app allows you to clear it in seconds, very convenient.

This isn't true from version 8 on forward. JB4 is now CARB compliant and cannot erase codes.

If you have version 7 or before, you can.

[HitmanHearns]

Originally Posted by G.Newt

This isn't true from version 8 on forward. JB4 is now CARB compliant and cannot erase codes.

If you have version 7 or before, you can.

I’m on version 8 and I can erase codes. I think you are confusing “erasing cel codes’ with “not having the cel code come up period.”

[bmw5858]

Originally Posted by HitmanHearns

I’m on version 8 and I can erase codes. I think you are confusing “erasing cel codes’ with “not having the cel code come up period.”

Exactly!

With the jb4, no matter the version you have you can always erase the code. But with the old version 7, you were able to put the auto delete ON. which mean no code were appearing.

Glad in Canada we can still do it

[G.Newt]

Originally Posted by HitmanHearns

I’m on version 8 and I can erase codes. I think you are confusing “erasing cel codes’ with “not having the cel code come up period.”

Ah, thanks for the correction.

[Jeff@TopGearSolutions]

Originally Posted by Frank Jia

Actually BMS jb4 officially doesnt recommend any Catless Downpipe on any B58 motor until flashTune available. It will cause terrible tune problems.

You won't reap the benefits of power without a tune, that would be correct.

[Frank Jia]

Originally Posted by Jeff@TopGearSolutions

You won't reap the benefits of power without a tune, that would be correct.

Not really on b58