P0420 toyota 4runner. P0420 toyota description the engine control module ecm monitors the switching frequency ratio of heated oxygen sensors 1 front o2 sensor and heated oxygen sensors 2 rear o2 sensor. A three way catalyst converter manifold with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. Toyota 4runner forum largest 4runner forum toyota 4runner forum 3rd gen t4rs p0420.
All p042x codes where x can be any number refer to the catalytic converter and exhaust system. A three way catalyst converter manifold with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. 09 08 2011 0520 pm 1.
The p0420 code in a toyota 4runner will often be thrown one of your oxygen sensors are not functioning properly.
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