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2013 328i CEL #5315366 01/06/20 11:29 PM
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vavavroom Offline OP
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Some time last summer I got a CEL and a code for "catalytic converter efficiency threshold" or something similar. The CEL went away after a few hundred miles only to return one day after getting the car smogged. The CEL stayed on until September when I stopped driving the car. Now, after a 4 month hiatus I drove the car a few times and yesterday the CEL did not come on and has remained off. I feel like I am driving through the Twilight Zone. The CEL led is working.

Re: 2013 328i CEL [Re: vavavroom] #5315374 01/06/20 11:58 PM
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clinebarger Offline
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Is the Catalyst Monitor "Ready"?


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: 2013 328i CEL [Re: clinebarger] #5315394 01/07/20 12:55 AM
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vavavroom Offline OP
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Yes. It takes at least 100 miles of driving without the error occurring for the CEL to remain off. That's how I passed the smog check. Had I just cleared the CEL, the tech would have seen that to he car had not performed its own diagnostics yet aka monitor not ready and thus the car would have failed the smog test by default. I wonder if I maybe got had got bad gas and the cat got contaminated. Maybe it is now teetering between passing an failing internal emission tests.

Re: 2013 328i CEL [Re: vavavroom] #5315430 01/07/20 03:36 AM
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Clubber_Lang Offline
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Originally Posted by vavavroom
Yes. It takes at least 100 miles of driving without the error occurring for the CEL to remain off. That's how I passed the smog check. Had I just cleared the CEL, the tech would have seen that to he car had not performed its own diagnostics yet aka monitor not ready and thus the car would have failed the smog test by default. I wonder if I maybe got had got bad gas and the cat got contaminated. Maybe it is now teetering between passing an failing internal emission tests.

Not trying to troll here, but consider moving to a non inspection state. I remember dealing with that. What a PITA! Just another pointless government intrusion into your life.

Last edited by Clubber_Lang; 01/07/20 03:49 AM.
Re: 2013 328i CEL [Re: Clubber_Lang] #5315529 01/07/20 07:16 AM
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SeaJay Offline
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Originally Posted by Clubber_Lang

Not trying to troll here, but consider moving to a non inspection state. I remember dealing with that. What a PITA! Just another pointless government intrusion into your life.


Live in NY, recently spent a lot of time in a non-inspection state. When there, I was walking through a large parking lot noticing the tread on the tires of parked cars (yes, I know a weird thing to do).

At least 10% of the cars, perhaps pushing 20% had tire tread that was rather worn, and would not have passed an annual safety inspection in NY.

I do agree, there is too much government intrusion and the smog tests IMO are over the top. But annual safety inspections for tires, horn, turn signals, lights, brakes and suspension system is useful and probably avoids more than a few road accidents. A certain percentage of folks will drive anything that move without safety inspections.

Re: 2013 328i CEL [Re: vavavroom] #5315573 01/07/20 08:09 AM
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supton Offline
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Yeah, it's a pain. Safety inspections have a place IMO, and it's not exactly death to have to repair a vehicle to keep the ODBII monitors happy. I mean, what did you expect, a car to run forever without repairs? Nothing does that. Roofs spring leaks, pipes give up, yards need seeding. Cars need tires, brakes, random repairs.

That said, now that I have a car that no longer needs to pass emissions... I hope to keep as long as possible. Unfortunately I suspect it's one of the cheapest vehicles out there to buy emissions equipment for! Dollars to doughnuts, I bet my late model vehicles probably would cost more to fix cats, injectors, whatever when they break...


2011 Toyota Camry, base, 2.5L/6MT, 200k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 157k, ours
1999 Toyota Camry LE, 2.2L/4AT, 220k, his
Re: 2013 328i CEL [Re: SeaJay] #5315751 01/07/20 11:32 AM
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Originally Posted by SeaJay
Originally Posted by Clubber_Lang

Not trying to troll here, but consider moving to a non inspection state. I remember dealing with that. What a PITA! Just another pointless government intrusion into your life.


Live in NY, recently spent a lot of time in a non-inspection state. When there, I was walking through a large parking lot noticing the tread on the tires of parked cars (yes, I know a weird thing to do).

At least 10% of the cars, perhaps pushing 20% had tire tread that was rather worn, and would not have passed an annual safety inspection in NY.

I do agree, there is too much government intrusion and the smog tests IMO are over the top. But annual safety inspections for tires, horn, turn signals, lights, brakes and suspension system is useful and probably avoids more than a few road accidents. A certain percentage of folks will drive anything that move without safety inspections.

Freedom is dangerous thing

I'll take dangerous freedom rather than peaceful slavery.

Last edited by Clubber_Lang; 01/07/20 11:40 AM.
Re: 2013 328i CEL [Re: SeaJay] #5315761 01/07/20 11:45 AM
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BMWTurboDzl Offline
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Originally Posted by SeaJay
Originally Posted by Clubber_Lang

Not trying to troll here, but consider moving to a non inspection state. I remember dealing with that. What a PITA! Just another pointless government intrusion into your life.


Live in NY, recently spent a lot of time in a non-inspection state. When there, I was walking through a large parking lot noticing the tread on the tires of parked cars (yes, I know a weird thing to do).

At least 10% of the cars, perhaps pushing 20% had tire tread that was rather worn, and would not have passed an annual safety inspection in NY.

I do agree, there is too much government intrusion and the smog tests IMO are over the top. But annual safety inspections for tires, horn, turn signals, lights, brakes and suspension system is useful and probably avoids more than a few road accidents. A certain percentage of folks will drive anything that move without safety inspections.


Could you imagine a TÜV (DEKRA, KÜS, GTÜ) level of inspection in the US? I'd guess that 15% of the existing automotive fleet would become instantly eligible for impound.

Last edited by BMWTurboDzl; 01/07/20 11:45 AM.

“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: 2013 328i CEL [Re: BMWTurboDzl] #5315785 01/07/20 12:31 PM
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supton Offline
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Originally Posted by BMWTurboDzl
Could you imagine a TÜV (DEKRA, KÜS, GTÜ) level of inspection in the US? I'd guess that 15% of the existing automotive fleet would become instantly eligible for impound.

I'd think more. Heck, I bet all three of mine would fail, maybe not impound-worthy, but failure all the same.


2011 Toyota Camry, base, 2.5L/6MT, 200k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 157k, ours
1999 Toyota Camry LE, 2.2L/4AT, 220k, his
Re: 2013 328i CEL [Re: BMWTurboDzl] #5315796 01/07/20 12:43 PM
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Trav Offline
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Originally Posted by BMWTurboDzl
Could you imagine a TÜV (DEKRA, KÜS, GTÜ) level of inspection in the US? I'd guess that 15% of the existing automotive fleet would become instantly eligible for impound.


Very few cars if any of the vehicles I see would pass.


ASE L1, Master. Deutsch Meisterbrief.
Re: 2013 328i CEL [Re: vavavroom] #5315797 01/07/20 12:44 PM
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Audios Offline
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Take it for a good ride, add some injector cleaner, and go to manual mode on the highway to get it out of overdrive. Sometimes on more gently driven cars the cats dont get to temperature enough and can throw faults for being dirty or loading up. By keeping the revs higher, youll get it up to temp and burn off any accumulated crap. Ive had 15 year old cats with cat faults, and after 40 miles on the highway the faults still havent returned after a few years.


2002 VW Golf TDI-T5 10/30
2007 Mercedes GL320 CDI- M1 0/30 ESP
2005 BMW M3 BMW-Twin Power 10/60
2003 BMW M5-M1 15/50
1998 BMW M3/4/5-M1 10/40
Re: 2013 328i CEL [Re: vavavroom] #5315801 01/07/20 12:51 PM
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brages Offline
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The P0420 type codes will come and go if the catalytic convertor is marginal.

The "anti-fouler trick" works, but I suppose it is illegal, maybe even a felony. Have never heard of any individual getting caught... yet.

There are some products (Cataclean) that supposedly will fix a marginal cat.

Don't throw parts (O2 sensors) at the problem.

Re: 2013 328i CEL [Re: Clubber_Lang] #5315842 01/07/20 01:46 PM
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Originally Posted by Clubber_Lang
Originally Posted by vavavroom
Yes. It takes at least 100 miles of driving without the error occurring for the CEL to remain off. That's how I passed the smog check. Had I just cleared the CEL, the tech would have seen that to he car had not performed its own diagnostics yet aka monitor not ready and thus the car would have failed the smog test by default. I wonder if I maybe got had got bad gas and the cat got contaminated. Maybe it is now teetering between passing an failing internal emission tests.

Not trying to troll here, but consider moving to a non inspection state. I remember dealing with that. What a PITA! Just another pointless government intrusion into your life.


I have no problem with regulations and inspections. Knowing human nature, I have a pretty good idea where we'd be without them. If the CEL keeps returning I will replace the cat.

Re: 2013 328i CEL [Re: vavavroom] #5315882 01/07/20 02:34 PM
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vavavroom Offline OP
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Originally Posted by Audios
Take it for a good ride, add some injector cleaner, and go to manual mode on the highway to get it out of overdrive. Sometimes on more gently driven cars the cats dont get to temperature enough and can throw faults for being dirty or loading up. By keeping the revs higher, youll get it up to temp and burn off any accumulated crap. Ive had 15 year old cats with cat faults, and after 40 miles on the highway the faults still havent returned after a few years.


It's got a six-speed. When I drive it I drive it pretty hard and for at least a couple hours. I don't drive this car that often and it's got only 60,000 miles on it. That's early for a defective cat. That's why I suspect I got bad gas, maybe more than once. How would injector cleaner help with the cat? I always run a bottle of RL SL1 before every oil change.

Re: 2013 328i CEL [Re: vavavroom] #5316094 01/07/20 07:06 PM
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Originally Posted by vavavroom
Originally Posted by Clubber_Lang
Originally Posted by vavavroom
Yes. It takes at least 100 miles of driving without the error occurring for the CEL to remain off. That's how I passed the smog check. Had I just cleared the CEL, the tech would have seen that to he car had not performed its own diagnostics yet aka monitor not ready and thus the car would have failed the smog test by default. I wonder if I maybe got had got bad gas and the cat got contaminated. Maybe it is now teetering between passing an failing internal emission tests.

Not trying to troll here, but consider moving to a non inspection state. I remember dealing with that. What a PITA! Just another pointless government intrusion into your life.


I have no problem with regulations and inspections. Knowing human nature, I have a pretty good idea where we'd be without them. If the CEL keeps returning I will replace the cat.

It's a good thing you like regulations, being that you live in Kali

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