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Old 06-02-2005, 02:35 PM
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Join Date: Mar 2000
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'97 E420 - Recurring P0410 - Clogged TWCs?

'97 E420, 120K miles, repeatedly displays OBDII code P0410 for the last several months. Air pump and clutch are functional but engine fails pump activation test: right cylinder bank mV barely drops below 40 at start of test and then climbs to > 200 by test's end; left cylinder bank initially drops to 100 then rapidly climbs to approx. 700 mV. Oxygen sensors are factory original. Vehicle was exposed to fuel with high sulfur content for approx. 2 weeks in May '04.

Engine performance has been WNL although idle has become rough as of late, despite plug renewal. Are cats partially clogged?
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