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2003 Chevrolet Impala LS 3.8L MIL Lamp on
Got this impala that has a p0420 and p0128 for thermostat and cat efficiency. I went ahead and slapped a thermostat in it because it was very quick and easy to do. That brought the temperature back up to specs. My question is the p0420. I didnt look at the o2s...
FIX posted 4/29/2015
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Message Closed w/FIX
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Related Documents & Media | VIN | 2G1WH55K13 |
| Engine | 3.8 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
Trouble Codes
| P0128 | Cooling System Malfunction |
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Message Closed w/FIX
Vehicle Data
2003 Chevrolet Impala LS
| VIN | 2G1WH55K13 |
| Engine | 3.8 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
Trouble Codes
| P0128 | Cooling System Malfunction |
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Video