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Old 01-22-2018, 01:30 PM   #1
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Default Code P0420

I have a 2008 Saturn Vue Redline with 193K miles. Iím getting code P0420, Iíve replaced the O2 sensor and still have the same code. Is there any thing else I can do to fix this or is replacing the catalytic converts the only option?

Thank you,
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Old 01-22-2018, 06:24 PM   #2
guyg will become famous soon enough
Join Date: Aug 2014
Location: North Jersey
Posts: 381

1997 SW2
2007 VUE 3.5L
Default Re: Code P0420

Carefully check for small exhaust leaks between the front and rear O2 sensors, especially the flex hose. A shop vac can supply air to pressurize the exhaust, use a soap and water solution to check for any bubbles. Any slight leak may set a code.
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