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P0420 Diagnostic Trouble Code Discussion for July 2007

Catalyst Efficiency Below Normal (Bank 1)


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Trouble Ticket Help Requests for DTC P0420
Help Request Posted
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E63
P0420: Catalyst Efficiency Below Normal (Bank 1). hey techs, I Have this toyota po420 The sensors are looking good But I have A concern,In The archives I did not fine A whole bunch Of po420 problems I did see use oem parts or you might have problems.I went back Into Alldata and looked up a possible tsb And f...
July 09, 2007
2000 Nissan Maxima GLE 3.0L MIL Lamp on, CODE P0420 VIN: JN1CA31D2Y
P0420: Catalyst Efficiency Below Normal (Bank 1). ... of these problems. 1 month later both these codes popped. No drive ability issues at all. Just codes with mil light. Replaced knock sensor, figured maybe it was messing w/ timing and popping code p0420. Got rid of code p0325 when replaced knock sensor. I a...
July 23, 2007
2003 Toyota Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E63
P0420: Catalyst Efficiency Below Normal (Bank 1). hey techs, I Have this toyota po420 The sensors are looking good But I have A concern,In The archives I did not fine A whole bunch Of po420 problems I did see use oem parts or you might have problems.I went back Into Alldata and looked up a possible tsb And f...
July 09, 2007
2000 Nissan Maxima GLE 3.0L MIL Lamp on, CODE P0420 VIN: JN1CA31D2Y
P0420: Catalyst Efficiency Below Normal (Bank 1). ... of these problems. 1 month later both these codes popped. No drive ability issues at all. Just codes with mil light. Replaced knock sensor, figured maybe it was messing w/ timing and popping code p0420. Got rid of code p0325 when replaced knock sensor. I a...
July 23, 2007