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P420 Catalyst system efficiency below threshold bank 1

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Old 09 September 2017, 12:55 PM
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mr2nut123
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Default P420 Catalyst system efficiency below threshold bank 1

I got this error code a few days ago after a long run. I did notice that the exhaust under the engine appears to be in quite bad shape when I did the oil change.

Here's a video of it running. It sounds far worse on video than in real life. It's quite a faint repetitive sound in person. Just an exhaust leak do you think..?

Old 10 September 2017, 06:08 PM
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TECHNOPUG
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Blown gaskets. I'd expect you'd be able to see exhaust exiting around the wheel on cold days.
Old 10 September 2017, 07:00 PM
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Originally Posted by TECHNOPUG
Blown gaskets. I'd expect you'd be able to see exhaust exiting around the wheel on cold days.
Cheers! I was worried it was a bottom end noise but it's not very crunchy like it sounds in the video.




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