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code 420 on 96 2.4L


schadd1971
09-12-2008, 03:48 PM
hi,,I have a 96 tacoma 2.7 L and code p 420 that says cat operating below efficent threshold and so I replaced the rear oxygen sensor which threw a code up as well and then replaced the cat ....the check engine light went off for a month or so and came back on....any ideas why.....no other codes...no code for the oxygen sensors......any input would be helpful....

schadd1971
07-07-2009, 09:11 PM
has anyone experienced this problem....the code went out in cold weather and came back on in hot weather

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