550i cat inefficiency code anyone ever replaced one ?
06-02-2022, 07:59 PM
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My Ride: E60 550i sport
550i cat inefficiency code anyone ever replaced one ?
So my 08 550i keeps coding on cat inefficiency. I have not verified that is is the cat but I am thinking it’s very possible. It looks like a major pita to replace has anyone ever done it ?
06-02-2022, 08:12 PM
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My Ride: E60 550i sport
I have a Foxwell scan tool. When I looked at the live data quickly a week or so ago it wasn’t clear to me. I plan to look again with inpa and see what the sensors are doing.
Any advice on verifying what the issue may be. I recall a video that liked at all 4 02 sensors pre and post cat and the post sensors should be fairly stable once warm. I couldn’t figure out how to do that with the foxwell scanner.
Any advice on verifying what the issue may be. I recall a video that liked at all 4 02 sensors pre and post cat and the post sensors should be fairly stable once warm. I couldn’t figure out how to do that with the foxwell scanner.
06-03-2022, 09:19 AM
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FWIW, my $10 (maybe $5?) Torque Pro app and $12 Bluetooth OBD dongle give me great O2 sensor graphing capabilities.
Before I'd replace a cat (ouch) I'd try replacing the downstream (post-cat) O2 sensor. Its only job is to report on how well the cat is performing, and the sensors can (and do) wear out. Plus, it a WHOLE lot cheaper and easier than swapping a cat.
Additionally, if your car has any kind of history of misfires or burning oil (changed that oil separator lately?) it can pile enough crud on the cat's grids to render it inoperable, or even plug it up to the point the car will barely run. If that might be the case, fix the problem, and do some road miles, with a couple "Italian tuneups" (full throttle runs to get the cat good and hot, which can help clear the build-up). There are fuel additives that are supposed to help clear this kind of thing, and there are reviews from a whole lotta people who claim that they worked for them. Maybe just snake oil, but cheap and easy.
Before I'd replace a cat (ouch) I'd try replacing the downstream (post-cat) O2 sensor. Its only job is to report on how well the cat is performing, and the sensors can (and do) wear out. Plus, it a WHOLE lot cheaper and easier than swapping a cat.
Additionally, if your car has any kind of history of misfires or burning oil (changed that oil separator lately?) it can pile enough crud on the cat's grids to render it inoperable, or even plug it up to the point the car will barely run. If that might be the case, fix the problem, and do some road miles, with a couple "Italian tuneups" (full throttle runs to get the cat good and hot, which can help clear the build-up). There are fuel additives that are supposed to help clear this kind of thing, and there are reviews from a whole lotta people who claim that they worked for them. Maybe just snake oil, but cheap and easy.
06-04-2022, 09:09 PM
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FWIW, my $10 (maybe $5?) Torque Pro app and $12 Bluetooth OBD dongle give me great O2 sensor graphing capabilities.
Before I'd replace a cat (ouch) I'd try replacing the downstream (post-cat) O2 sensor. Its only job is to report on how well the cat is performing, and the sensors can (and do) wear out. Plus, it a WHOLE lot cheaper and easier than swapping a cat.
Additionally, if your car has any kind of history of misfires or burning oil (changed that oil separator lately?) it can pile enough crud on the cat's grids to render it inoperable, or even plug it up to the point the car will barely run. If that might be the case, fix the problem, and do some road miles, with a couple "Italian tuneups" (full throttle runs to get the cat good and hot, which can help clear the build-up). There are fuel additives that are supposed to help clear this kind of thing, and there are reviews from a whole lotta people who claim that they worked for them. Maybe just snake oil, but cheap and easy.
Before I'd replace a cat (ouch) I'd try replacing the downstream (post-cat) O2 sensor. Its only job is to report on how well the cat is performing, and the sensors can (and do) wear out. Plus, it a WHOLE lot cheaper and easier than swapping a cat.
Additionally, if your car has any kind of history of misfires or burning oil (changed that oil separator lately?) it can pile enough crud on the cat's grids to render it inoperable, or even plug it up to the point the car will barely run. If that might be the case, fix the problem, and do some road miles, with a couple "Italian tuneups" (full throttle runs to get the cat good and hot, which can help clear the build-up). There are fuel additives that are supposed to help clear this kind of thing, and there are reviews from a whole lotta people who claim that they worked for them. Maybe just snake oil, but cheap and easy.
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