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If a Honda Accord has OBD code P0420 in the catalyst bank is it the oxygen sensor or the catalytic converter?
Wiki User
∙ 9y ago
There are a number of things that could be causing the P0420 catalyst efficiency code. The most common thing is the catalytic converter is no longer working. The other thing is the rear oxygen sensor is no longer working properly or there is a leak in the exhaust system.
Wiki User
∙ 9y ago
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99 windstar is running lean did diagnostic test said bank 1 and 2?
Bank 1 is the upper oxygen sensor(s) before the catalyst (catalytic converter) bank 2 is the oxygen sensor after the catalyst (catalytic converter)
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From what I understand , the oxygen sensor ( s ) upstream of the catalytic converter is used in the control of the air / fuel ratio . The oxygen sensor downstream of the catalytic converter is called a catalyst monitor and monitors the efficiency of the catalytic converter
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Check for exhaust leaks, test oxygen sensor operation, replace the catalytic converter.Check for exhaust leaks, test oxygen sensor operation, replace the catalytic converter.
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After the exhaust manifold but before the catalytic converter on the exhaust tube.
How do you fix P0420 catalyst efficiency below threshold?
Check for exhaust leaks, test oxygen sensor operation, replace the catalytic converter.
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The oxygen sensor on a 2004 Honda Accord is found on the exhaust system. They are placed close to the catalytic converter so the sensors can properly read the exhaust flow.
