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      09-22-2017, 08:30 AM   #1
Frenchies_M5
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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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      09-22-2017, 02:56 PM   #2
Vonhaas
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That's the fault I get with catless downpipes. Maybe you have a broken O2 sensor?
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      04-23-2018, 08:08 PM   #3
epiphanyray
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Quote:
Originally Posted by BMWfan95 View Post
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).
Did the car perform any differently (low on power?) How did you get this corrected?
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      04-23-2018, 09:18 PM   #4
Frenchies_M5
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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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Quote:
Originally Posted by Frenchies_M5 View Post
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).
hey - i know this is a old post but what was your resolution to this?
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