Thread: Code P0420
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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: 380

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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