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2002 Chevrolet Impala 3.4L MIL Lamp on
Car came in with P0420 code (Catalyst System Low
Efficiency) running fine. Checked the rear O2 sensor and
found too much activity. Replaced the after market cat with
OEM cat and rear O2 sensor.
FIX posted 10/2/2007
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Message Closed w/FIX
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Related Documents & Media | VIN | 2G1WF55E72 |
| Engine | 3.4 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Always |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Message Closed w/FIX
Vehicle Data
2002 Chevrolet Impala
| VIN | 2G1WF55E72 |
| Engine | 3.4 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Always |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Video