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what is po420 for a Suzuki Forenza-4 cylinder-2007

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I got a code of p0420 for a 2007 Suzuki Forenza, what does that mean?

Vehicle: 2007,suzuki,forenza 4 cylinder

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HI there,

P0420 catalyst efficiency below threshold. This basically means the converter isn't working as good as it should to clean the exhaust. This could be the result of a bad converter, a poorly running engine or even a problem with the rear O2 sensor.

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