Light diagnosed again-
- Thread starter andysat
- Start date
As mentioned before Andy you have quite sensibly eliminated the 'other' common possible causes of an emissions fault code including sorting cracked manifold replacing sensors etc etc. Fuelling faults caused by these going down do damage a catalyst, the logical conclusion is that it's a faulty Catalyst. This is not an E85 2.0 issue, or even a BMW issue that fault code is very common and although extraneous causes are vary on make/model once eliminated a new Cat usually returns the car to good health.
Unfortunately we have to accept parts like a cat don't last for ever, mines 10 years old now and assume the Cat may go, it's an inevitable running cost
Unfortunately we have to accept parts like a cat don't last for ever, mines 10 years old now and assume the Cat may go, it's an inevitable running cost
Cheers mate- just difficult to justify spending 1k + on a car worth 5k.Ewazix said:As mentioned before Andy you have quite sensibly eliminated the 'other' common possible causes of an emissions fault code including sorting cracked manifold replacing sensors etc etc. Fuelling faults caused by these going down do damage a catalyst, the logical conclusion is that it's a faulty Catalyst. This is not an E85 2.0 issue, or even a BMW issue that fault code is very common and although extraneous causes are vary on make/model once eliminated a new Cat usually returns the car to good health.
Unfortunately we have to accept parts like a cat don't last for ever, mines 10 years old now and assume the Cat may go, it's an inevitable running cost
andysat said:Cheers mate- just difficult to justify spending 1k + on a car worth 5k.Ewazix said:As mentioned before Andy you have quite sensibly eliminated the 'other' common possible causes of an emissions fault code including sorting cracked manifold replacing sensors etc etc. Fuelling faults caused by these going down do damage a catalyst, the logical conclusion is that it's a faulty Catalyst. This is not an E85 2.0 issue, or even a BMW issue that fault code is very common and although extraneous causes are vary on make/model once eliminated a new Cat usually returns the car to good health.
Unfortunately we have to accept parts like a cat don't last for ever, mines 10 years old now and assume the Cat may go, it's an inevitable running cost
I know exactly what you mean, my girlfriend's Yaris has had an EML on for the past 2 years, sometimes it feels like the huge bill isn't worth it, especiall when her Yaris is worth about 1k! Hope you manage to get a decent solution sorted.
Andy, I'm going to say it again, take it out and give it a good hard drive like its meant to be driven. They like and sometimes need to be driven to clean the internals up.
Look at modern diesels. If they are not used on long runs and high enough revs the DPF's will not regenerate and need replacing.
Look at modern diesels. If they are not used on long runs and high enough revs the DPF's will not regenerate and need replacing.
srhutch said:
Precisely why I thrash every car I own :lol:
Dogmatic6 said:
Interesting...my ///M had this fault code a couple of times in my first six months of ownership. It's been fine for years though, perhaps through me enacting the solution srhutch proposed!
Andy, do you still have that 4-5 mile journey back and forth to work through a 30mph built up area?
andysat said:
That could be the reason, take it for a high revving scorch on the motorway for 10 miles or so and if the light goes off then you know the reason,
I guess you've seen this before, or similar :-http://www.obd-codes.com/p0420, ever thought of just taking the Cat. off and having a look inside ?
as far as I understand it's to do with the difference between the two sensors either side of the Cat., see below Quote from that website I told you about :-
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.
Read more at: http://www.obd-codes.com/p0420
Copyright © OBD-Codes.com
So If it was slightly blocked due to carbon build up maybe it could cause this light, I'm no expert on Cats by any means, but a long drive doesn't cost too much !, just my twopence worth.
And some more reading for you..http://www.aa1car.com/library/p0420_dtc.htm
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.
Read more at: http://www.obd-codes.com/p0420
Copyright © OBD-Codes.com
So If it was slightly blocked due to carbon build up maybe it could cause this light, I'm no expert on Cats by any means, but a long drive doesn't cost too much !, just my twopence worth.
And some more reading for you..http://www.aa1car.com/library/p0420_dtc.htm
that would be the first thing to do and I bet the light goes off Andy. :wink:
