
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
![]()
iATN Members:
Login to view full TechHelp request Auto Repair Pros: Join iATN to read this TechHelp request Vehicle Owners: Find a nearby iATN member to repair your vehicle (View Replies)9 Replies Received(Hide Replies)9 Replies Received
|
Message Closed w/FIX
|
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) |