P0420 Diagnostic Trouble Code Discussion for April 2010
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 2003 Lincoln LS 3.9L MIL Lamp on VIN: 1LNHM87A03 P0420: bank 2 cat below threshold. after clearing ml lamp, light will come on after about 15 miles of driving runs and drive ok |
April 01, 2010 | |
| 2005 Kia Rio 1.6L Poor Fuel Economy, MIL Lamp on VIN: KNADC12535 P0420: Catalyst Efficiency Below Normal (Bank 1). This car has been in several times. O2 sensors were replace 2-3 times. final time, original equipment O2 sensors were installed. Code reoccured. After following All-Data and mitchell testing, computer was replaced. Still no solution. Have checked resistance on... |
April 07, 2010 | |
| 2001 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1ND52J21 P0420: Catalyst System Bank 1 Low Efficiency. This car had a grand total of 4 cat on it, the first one was a after market and the other were walkers cats. after about 1000 miles or 3months it would eat up a cat and the o2's would be the same and it would have a code po420 The cat will not light up.No wate... |
April 22, 2010 | |
| 2007 Chrysler Town & Country 3.3L MIL Lamp on VIN: 2A46P54L67 P0420: Catalyst Efficiency Below Normal (Bank 1). ... months. Originally we had a lean code and had bad pre cat sensor. After replacing that car was gone for a month. It came back and we replaced the down stream sensor. A month later we replaced the cat. Now it has been another month and we have code P0420 an... |
April 22, 2010 |
