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Old 28th July 2011, 12:34   #1
mjac
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Catalytic converter bank 1&2 problems

I really hope any of you can help me now. Have had this problem to battle with in the past months now.
Problem is that the faulty codes "catalytic converter bank 1 & 2" comes up.
As previous read and discussed in threads here I have changed the lambda/CO2 sensors and the temperature sensors for the cats.
As I see it, It is unlikely both cats that not work. Anyhow I have had the cats checked and looked into them and everything seems good with them. They are in good condition.
I have also now changed the "air mass meters", do not know the right name in english, but the units measuring and setting the mix air/fuel.
But I still get the problem that the exhuast gas-values light turns on.

The other strange thing with this issue is that the light turns on after around 160 km (100 miles). That means that I read off the error codes and get the light turned off, then I can drive totally normal and after 100 miles it turns on again. So strange, tried it three times now and get the same result every time.

Should also be noted that before as after the lights turns on, the car goes great, there are nothing strange with how the car acts so it does not "feel" like problems.

Does anyone have further ideas or has been through the same story?

2006 m5 (55000miles)
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Old 28th July 2011, 13:09   #2
Hasan Shaikh
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This is quite strange.

It might be worth while to get the ionic control unit checked.
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Old 8th August 2011, 22:45   #3
mjac
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Hi,
The ionic box? What is that?
I have read on the forum, but that seems to do the unit control the engine? Just to be sure, I have no noticed problems with the engine. It seems to be with the exhaust gas values..?
But perhaps the ionic box affects that as well?
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Old 9th August 2011, 12:00   #4
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Quote:
Originally Posted by mjac View Post
Hi,
The ionic box? What is that?
I have read on the forum, but that seems to do the unit control the engine? Just to be sure, I have no noticed problems with the engine. It seems to be with the exhaust gas values..?
But perhaps the ionic box affects that as well?
The ionic control unit acts as a knock sensor on these cars. I would suggest you take the car to the dealer and have them diagnose the problem for you.
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Old 10th August 2011, 21:19   #5
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I would be inclined to believe that it is in fact your cats. You have changed the 4 O2 sensors and the MAF sensors on both intakes all that remains would be the CATS. As far as the the miles driven between code clearing and emmisions light, that is normal. Whenever you clear the codes on an emmisions related fault the car has to be driven a number of miles before the code is thrown again. Most of the time (at least on cars I have repaired) that milage is between 70 and 100 miles. The ECM needs an certain amount of stored emmisions data before throwing the code, that data is captured in start cycles (30 cycles roughly) and miles driven. The only real way to solve this is to take the car to a dealer or Indy that can measure the oxgen values of the exhaust and then compair them to the BWM spec for the M5. Your ECM is still measuring a exhaust value that is over the max limit set by BMW. Cats loose effeciency over time, a visual inspection is not enough to determine catalytic effeciency. All a visual inspection will do is determine if the catalist materal has broken down and started to crack or worse had a hole burnt through it. Get them tested and I bet you find they need replaced.

Hope this helps....I learned all this the hard way on the exact same type of problem, however the car was a 04 Nissan. Both cars M5 and Nissan use OBDII as the operating system so they should be very similar in operation.

Good luck!
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Old 29th October 2011, 02:59   #6
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Just had my 2 cats replaced. Pulled the two exact code; took it to dealer and they agreed the cats were gone after they pulled same code. $10k later (covered by BMW 8 year/80,000 mile warranty) I was back on the road. What's interesting is that I was averaging about 13mpg city and about 17 highway prior. After the replacement, I'm averaging 16 city / 20 highway. Not sure if the new cats make a differenceg, but not complaining.
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Old 29th October 2011, 05:29   #7
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I also think it is your cats...when a car says catalyst efficiency below threshold there is pretty much nothing else it could be...but it's also a good idea to find out why they failed...
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Old 22nd November 2011, 11:27   #8
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Hi,

I have a similar story.
Does your car increase idle frequently at normal operating temp., like it does at cold start to heat the cats? Up to 900-1000rpm and change exhaust sound. Mine m6 had this problem when I bought, also check engine light was on. I have checked the error codes, and found that thermostat and water temp sensor were faulty. I replaced them along with the vanos solenoids (The test result was 0.45-0-50). Now no error codes and CEL does not illuminate. But the idle problem is still existing. It looks like the car is trying to heat up the cats. Two options wrong signal from the sensors or inefficient cats like 1hotm5 says. I was trying to figure out if it is catalytic converters that cause this problem, I found your thread.
If you have idle problems like me it seems like you have faulty cats. I will check the O2 and temp sensors at the exhaust. If they are ok too, I would conclude my problem as cats, too...

If it is the cats, the reason shoud be found.
My suggestions;
High oil consumption, (mine consume 1l/1000miles)
Faulty temp sensor (like mine)

any other suggestion will be appreciated, since I am also not 100% sure with my problem..

By the way this is my first post in this forum so hi to everyone who is reading.
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Old 3rd January 2012, 18:21   #9
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WoW,
I thought I was the only one but taking my car in found that one of the cats in my headers needs replacement.
I mean how does that happen at 15k miles - What **** has been put into these machines costing an arm and a leg that goes out at 15k miles.

Anyway,
BMW agrees for a replacement header and is fixing the problem, glad I was under warranty.
The funny thing is I was doing 14.5 highway\city combined not sure if that says anything but expecting a little more after the problem has been fixed.
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