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H3 P0420 CEL code

mrchew

Member
Messages
19
Location
hutto, tx
I got CEL for months and thought it was O2 sensors so I replaced both. Same code. Last year I already replaced with aftermarket exhaust manifold and that cleared code. Could it be exhaust manifold again?


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lowtrac

Well-Known Member
Messages
222
Location
Georgia
I have the code occasionally too. I’ve already replaced the down stream O2 sensor. I do have an exhaust leak at the flange under the passenger rear door though, so I’m hoping when I fix that it’ll clear up.



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