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P0420 Diagnostic Trouble Code Discussion for March 2014

Catalyst Efficiency Below Normal (Bank 1)

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Trouble Ticket Help Requests for DTC P0420
Help Request Posted
2001 Chevrolet Suburban 1500 5.3L Catalyst monitor VIN: 3GNFK16T81
P0420: Catalyst System Low Efficiency (Bank 1). Hi guys i replaced catalytic convertors due to code po420, i have driven car probably 50 miles still won't run catalyst monitor. Alldata says to drive car at 55mph for 5 minutes, then decelerate to zero miles per hour without touching the brake. This is very ...
March 13, 2014
2002 Chevrolet Camaro 3.8L Cuts out, MIL Lamp on VIN: 2G1FP22K12
P0420: Catalyst System Low Efficiency. thanks in advance for any help given.this camaro came in with check engine lamp on po420,ltft was high i checked 02s,b1s2 was dead so i replaced it and fuel filter.customer didnt want to pay for setting monitors so they took the car.they went to a local do it ...
March 31, 2014