[anujatd]

Ran the AA Catted DP for about 5 months now, ~3.5k miles. Car got a CEL today and got code 180001 "Catalytic Converter: Efficiency below limit value"

Anyone else getting CEL with this DP? My car is not/never was tuned!

Today's the first day it got pretty hot here in NYC since i've added the DP- not sure if heat has anything to do with it?

Any help would be appreciated

[G.Newt]

Clear it, see if it comes back. Contact AA if it does.

[mike@x-ph.com]

Originally Posted by G.Newt

Clear it, see if it comes back. Contact AA if it does.

+1

They'll take care of it if the cat failed. I know they updated their cats no too long to a newer version

[anujatd]

Originally Posted by G.Newt

Clear it, see if it comes back. Contact AA if it does.

Tried clearing it with Bimmerlink, but I get an error that says something along the lines like "Code could not be cleared, please try again"

[f22b58]

Bimmerlink did not work for me either. I used a $10 app called ODB Fusion. It works but it resets your adaptations.

[WrxToBeamerGuy]

Originally Posted by anujatd

Ran the AA Catted DP for about 5 months now, ~3.5k miles. Car got a CEL today and got code 180001 "Catalytic Converter: Efficiency below limit value"

Anyone else getting CEL with this DP? My car is not/never was tuned!

Today's the first day it got pretty hot here in NYC since i've added the DP- not sure if heat has anything to do with it?

Any help would be appreciated

AA as in Active Autowerke?

I've got one of these too so im curious what happens.

[Wires]

I cannot comment if AA units will give the CEL, but many high flow cat units do. And yes, it seems higher temps do cause the CEL to trigger (hotter exhaust temps probably?)

You might need to get one of those right-angle O2 offset adapters off Amazon for the lower O2 sensor to get it out of the stream.

[Bay23]

Originally Posted by Wires

I cannot comment if AA units will give the CEL, but many high flow cat units do. And yes, it seems higher temps do cause the CEL to trigger (hotter exhaust temps probably?)

You might need to get one of those right-angle O2 offset adapters off Amazon for the lower O2 sensor to get it out of the stream.

Would the O2 spacer change the air fuel ratio?

[anujatd]

Originally Posted by Wires

I cannot comment if AA units will give the CEL, but many high flow cat units do. And yes, it seems higher temps do cause the CEL to trigger (hotter exhaust temps probably?)

You might need to get one of those right-angle O2 offset adapters off Amazon for the lower O2 sensor to get it out of the stream.

Its the no CEL guarantee one. And I think you're right about the higher temps. It was significantly cooler today and when I started the car, no CEL. Drove about 40 miles today and no issues after a few warm starts.

91 degrees on Sunday so lets see what happens, i'll report back

[drivef30]

Originally Posted by Bay23

Would the O2 spacer change the air fuel ratio?

Yes, primary O2 sensor calibrates the secondary O2 sensor. Will it work to eliminate CEL possibly? Will it ruin calibration yes.... enough to harm engine? Not sure but probably not worth it. For anyone else thats about to challenge me on this LOL, watch youtube videos that explain how BMW uses a wideband O2 on these cars.

[Bay23]

Originally Posted by drivef30

Yes, primary O2 sensor calibrates the secondary O2 sensor. Will it work to eliminate CEL possibly? Will it ruin calibration yes.... enough to harm engine? Not sure but probably not worth it. For anyone else thats about to challenge me on this LOL, watch youtube videos that explain how BMW uses a wideband O2 on these cars.

Thank you appreciate the info

[drivef30]

Just for anyone wondering, this is what I was talking about:

[dmanb2b]

running mine for 5 months now...no cel

[Wires]

Originally Posted by Bay23

Would the O2 spacer change the air fuel ratio?

No, the secondary O2 sensor is just there to confirm that the cat is doing it's job properly. The primary (above the cat) is used for AFR adjustment.

[Wires]

Originally Posted by drivef30

Yes, primary O2 sensor calibrates the secondary O2 sensor. Will it work to eliminate CEL possibly? Will it ruin calibration yes.... enough to harm engine? Not sure but probably not worth it. For anyone else thats about to challenge me on this LOL, watch youtube videos that explain how BMW uses a wideband O2 on these cars.

If that was really true then anyone running high flow cats, or catless would just destroy their engines. The O2 sensor is measuring O2 levels (gasoline is high in O2).

If the emission system is doing it's job correctly the cats have burnt off any fuel so the secondary O2 shouldn't see any residual. The offset adapter just takes the tip of the O2 sensor out of the flow. It's still seeing the same exhaust though.

[anujatd]

Originally Posted by anujatd

Its the no CEL guarantee one. And I think you're right about the higher temps. It was significantly cooler today and when I started the car, no CEL. Drove about 40 miles today and no issues after a few warm starts.

91 degrees on Sunday so lets see what happens, i'll report back

Drove all day today and no CEL. My car was just having a bad day on Thursday I guess

[drivef30]

Originally Posted by Wires

If that was really true then anyone running high flow cats, or catless would just destroy their engines. The O2 sensor is measuring O2 levels (gasoline is high in O2).

If the emission system is doing it's job correctly the cats have burnt off any fuel so the secondary O2 shouldn't see any residual. The offset adapter just takes the tip of the O2 sensor out of the flow. It's still seeing the same exhaust though.

Clearly, you havn't taken the time to watch the video I posted.

All I said was the secondary calibrates the primary o2. For example, just because the car will run without the MAF plugged in doesn't mean the car will suffer in someway... The MAF calibrates other aspects of the. Similarly, the secondary O2 calibrates the primary for the reasons mentioned in the video. As I also said in my other comment, its probably not going to ruin the engine but might affect some aspects of the car.

Ill give you another whiff of the pie, without giving you the whole pie... since you dont like watching videos."using a Bosch algorithm which takes the post cat sensor information to compensate for aging on the primary 02 sensors" and "The post-cat sensors are used to calibrate a 1.0 lambda for the widebands. The narrow bands are extremely accurate around stoich (1.0 lambda)." you can find the threads I found this at and read more into why a spacer isnt the best idea.

Hopefully you can find these threads and the thousands others and "enlighten those people" on how this DOCUMENTED fact is null and void; and that your testing + experience of others, is the only thing people should follow as engineers are overpaid for the technology they put into cars.

[Wires]

Originally Posted by drivef30

Clearly, you havn't taken the time to watch the video I posted.

All I said was the secondary calibrates the primary o2. For example, just because the car will run without the MAF plugged in doesn't mean the car will suffer in someway... The MAF calibrates other aspects of the. Similarly, the secondary O2 calibrates the primary for the reasons mentioned in the video. As I also said in my other comment, its probably not going to ruin the engine but might affect some aspects of the car.

Ill give you another whiff of the pie, without giving you the whole pie... since you dont like watching videos."using a Bosch algorithm which takes the post cat sensor information to compensate for aging on the primary 02 sensors" and "The post-cat sensors are used to calibrate a 1.0 lambda for the widebands. The narrow bands are extremely accurate around stoich (1.0 lambda)." you can find the threads I found this at and read more into why a spacer isnt the best idea.

Hopefully you can find these threads and the thousands others and "enlighten those people" on how this DOCUMENTED fact is null and void; and that your testing + experience of others, is the only thing people should follow as engineers are overpaid for the technology they put into cars.

So your "gospel" source is a some guy's random YouTube video?

Again, if that video WAS ACCURATE then NOBODY could run their car catless. It would lean out the car and it just wouldn't run, and it would be tossing a ton of codes around invalid fuel trim values.

But heh, believe what you want!

[zen_f30]

Originally Posted by anujatd

Its the no CEL guarantee one. And I think you're right about the higher temps. It was significantly cooler today and when I started the car, no CEL. Drove about 40 miles today and no issues after a few warm starts.

91 degrees on Sunday so lets see what happens, i'll report back

Good to hear that the CEL went away. I would definitely test it out again in warmer weather to see if it's the heat. I'm wondering if the heat could be degrading the catalytic converter.

How do you like the AA downpipe on the untuned car? Most people run downpipes with a stage 1 tune, so I'm curious what gains you've noticed?

[anujatd]

Originally Posted by zen_f30

Good to hear that the CEL went away. I would definitely test it out again in warmer weather to see if it's the heat. I'm wondering if the heat could be degrading the catalytic converter.

How do you like the AA downpipe on the untuned car? Most people run downpipes with a stage 1 tune, so I'm curious what gains you've noticed?

Was 92 degrees here today in NY and I drove another 20-25 miles. Drove pretty hard- no CEL.

Tbh, I haven't noticed much performance wise, but the car is much louder than before. Just riding out my factory warranty before I tune stage 2. I just couldn't resist buying the AA DP, intake and chargepipe from xph during their black friday sale.

[zen_f30]

Originally Posted by anujatd

Was 92 degrees here today in NY and I drove another 20-25 miles. Drove pretty hard- no CEL.

Tbh, I haven't noticed much performance wise, but the car is much louder than before. Just riding out my factory warranty before I tune stage 2. I just couldn't resist buying the AA DP, intake and chargepipe from xph during their black friday sale.

Yeah I almost bought the AA DP, AWE exhaust, and BM3 from XPH last year during Black Friday. I had everything in my cart but never pulled the trigger because I'm still not sure if I'm going to keep the car or upgrade.

[BMWILUVU]

Originally Posted by Wires

So your "gospel" source is a some guy's random YouTube video?

Again, if that video WAS ACCURATE then NOBODY could run their car catless. It would lean out the car and it just wouldn't run, and it would be tossing a ton of codes around invalid fuel trim values.

But heh, believe what you want!

EXACTLY. I had this same discussion months back maybe with the same guy on some thread. The person said MHD says so and provided the video. ISTA says downstream is only for CAT efficiency. I don't know of any manufacturer out there which would use a downstream for AFR. If you think about it, would BMW really allow AFR to go out of whack because of CAT degradation or a stuck CAT? So a CAT goes and we blow the engine? Makes no sense.