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Thread: P0420......but what causes it?
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Old 07-31-2020, 10:41 PM
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I have the same code.
Mine is being caused by my bad gasket in the flange connecting the cat convertor to the exhaust pipe.
Mine is making a ticking sound and I can also feel exhaust air coming out of it so I would say check first for leaks in your manifold all the way down to your tail pipe.
But like others have said it can be caused by a few other things but keep your fingers crossed it isn't the cat convertor!
Best of luck
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