Hi all,
I got this error on my 2011 S550 4matic. I heard from a solid source (2007 S550 owner) that he solved this error by removing and 'cleaning' the potion of the passenger side exhaust that has the catalytic converter. It was cleaned by soaking it over night in lacquer thinner to remove the impurities and this cleared the error code.
On a previous post someone with a 2008 S550 who had the same error was advised to replace their O2 sensors. No resolution was posted after this suggestion...
P0420 Catalyst System Efficiency Below Threshold Bank 1.
I got this error on my 2011 S550 4matic. I heard from a solid source (2007 S550 owner) that he solved this error by removing and 'cleaning' the potion of the passenger side exhaust that has the catalytic converter. It was cleaned by soaking it over night in lacquer thinner to remove the impurities and this cleared the error code.
On a previous post someone with a 2008 S550 who had the same error was advised to replace their O2 sensors. No resolution was posted after this suggestion...
P0420 Catalyst System Efficiency Below Threshold Bank 1.
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