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Johnsonjf 01-22-2018 01:30 PM

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,
Jeff

guyg 01-22-2018 06:24 PM

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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