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1997 Pontiac Grand Am SE 3.1L MIL Lamp on
Next step in flow chart would be to replace the catalytic convertor (3 way). My concern is the o2 sensors are reading the way i think they should . Convertor not lit.( not hot ) both read about the same. .23 to .789 . convertor hot front convertor .23 to .795 ...
FIX posted 5/15/2001
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| VIN | 1G2NE52M9V |
| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / port |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
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Vehicle Data
1997 Pontiac Grand Am SE
| VIN | 1G2NE52M9V |
| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI / port |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Intermittently |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
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