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2002 Buick Century Custom 3.1L MIL Lamp on
Vehicle came in with P0420 Cat effciency code. Checked o2's and found these strange readings. At idle pre cat o2 working fine. Post cat o2 sitting @ .400mv. LTFT -4%. Then when revved to 2500 in park... LTFT goes to -14/-16%. Pre cat o2 still toggles great. Po...
FIX posted 8/23/2007
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Message Closed w/FIX
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8 Replies Received
8 Replies Received
Related Documents & Media | VIN | [No VIN Available] |
| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Not Applicable |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Message Closed w/FIX
Vehicle Data
2002 Buick Century Custom
| VIN | [No VIN Available] |
| Engine | 3.1 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Not Applicable |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
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