09-22-2017, 08:30 AM | #1 |
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Catalyst system efficiency below threshold bank
Hey guys my '13 m5 just threw the engine light. Stopped by an auto advance to borrow their machine to read the codes since the car wasn't saying anything other than the light. It came up with the error p0420 which is catalyst system efficiency below threshold bank. Any body know what that could be. I recently got a muffler delete done on the car. (aprox. 2weeks ago).
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2013 BMW M5 Silverstone Metallic/ Black Interior
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04-23-2018, 08:08 PM | #3 | |
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04-23-2018, 09:18 PM | #4 |
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Not to my knowledge. The light turns on and turns it's sell off after a certain amount of time. Doing research it's because the car doesn't have the valves on the exhaust anymore which is why when they were closed at low RPM it would allow for some back pressure to be created.
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07-02-2019, 07:49 AM | #5 | |
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