2005 Chevrolet Uplander LS 3.5L MIL Lamp on
After a few weeks of driving the SES will set 420 as a Catalyst System Low Efficiency. I have checked back preshure (ok) and inspected with frontside of converter with bore scope (no problem). While watching the upstream and downstream O2s together the upstrea...
Summary posted 3/5/2012
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Vehicle Data2005 Chevrolet Uplander LS
Trouble Codes
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Message Closed w/Summary
Vehicle Data
2005 Chevrolet Uplander LS
VIN | 1GNDX33165 |
Engine | 3.5 L / 6 cyl / GAS |
Trans | 4-speed Automatic (Electronic) |
Delivery | Fuel Injection |
Emissions | OBD-II Compliant |
Symptoms | MIL Lamp On |
Occurs | Intermittently |
Misc. | Awd |
Trouble Codes
P0420 | Catalyst Efficiency Below Threshold (Bank 1) |