Question about 2001 Honda Accord

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P0401,P 0420, CODE IN HONDA ODYSEY

CAN SOMEBODY TELL HOW TO TRUBLE SHOOT THIS TWO CODE

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P0401- Bad EGR valve
P0420- Most likely cause is a bad O2 sensor(s) at the catalytic converter

Posted on Sep 09, 2009

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P0401 is exhaust gas recirculation or EGR system. Could be several things that cause this such as a hose leak or blockage, could be a wiring problem or most likely a EGR valve or EGR solenoid. Could be ECM but doubtful it is this.

P0420 could set because of the problem with P0401 code. P0420 is Catalytic converter system code. Could be problem with Catalytic converter plugged up or problem with H02S 2 (Oxygen sensor bank 2)

Takes quite a lot to trouble shoot most of these problems. You could buy a Haynes or Mitchell repair manual and they will walk you through some of the test procedures for these problems.

Posted on Sep 09, 2009

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