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2001 Pontiac Bonneville SLE 3.8L MIL Lamp on
Hello all, This Bonneville sets a P0420 converter code randomly. It typically happens at idle. It first came to me with an aftermarket converter that was very small. I connected my scanner and monitored fuel trims and watched the Upstream and downstream o2's. ...
FIX posted 3/18/2010
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Message Closed w/FIX
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9 Replies Received
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Related Documents & Media | VIN | 1G2HY54K81 |
| Engine | 3.8 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Idle |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Message Closed w/FIX
Vehicle Data
2001 Pontiac Bonneville SLE
| VIN | 1G2HY54K81 |
| Engine | 3.8 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | MIL Lamp On |
| Occurs | Idle |
Trouble Codes
| P0420 | Catalyst Efficiency Below Threshold (Bank 1) |
Video