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Rrplace sensors both of them keeps showing 420

Vehicle: Suzuki aerio 2004 sx 2.3 liter

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Hi there,

Well this code is for a bad catalytic converter, so you might have replaced the sensors but if the converter itself is the source of the problem it won't help.

Also, if the engine isn't running well, or the plugs aren't burning the fuel clean, you could get this code because the converter can't get it all cleaned out.

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