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2003 Pontiac Grand Prix SE 3.1L MIL Lamp on
installed used motor(low mileage motor)with no problems. after 5k check engine came on po420. downstream o2 sensor looked sluggish, replaced it. came back shortly after with check engine on again po420. watched o2 sensors cat looked dead, replaced with afterma...
FIX posted 6/25/2008
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Related Documents & Media | VIN | 1G2WK52J73 |
| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Message Closed
Vehicle Data
2003 Pontiac Grand Prix SE
| VIN | 1G2WK52J73 |
| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
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