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Old 01-16-2018, 04:29 PM   #1
Johnsonjf
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Default Code 420

Good afternoon,

I have a 2008 SATURN Vue with 197K miles. Iím getting code P0420, Catalyst System Effeciency Below Threashold (Bank 1). Iíve looked online and it can be either the O2 sensor or the converter. The vehicle has not lost any performance of mileage. This particular sensor is the one behind the converter (downstream) correct?

Thanks,
Jeff

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Old 01-16-2018, 07:14 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Code 420

What state do you live in and does your state require emissions tests. Which engine?

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Old 01-17-2018, 04:50 PM   #3
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Default Re: Code 420

Texas and yes emissions testing is required for annual inspection and registration

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