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2005 Chevrolet Uplander LS 3.5L MIL Lamp on
Posted to GM Driveability on 2/17/2012 24 Replies

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...

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  Related Documents & Media  2005 Chevrolet Uplander LS

 
Message Closed w/Summary

car Vehicle Data

2005 Chevrolet Uplander LS

VIN 1GNDX33165
Engine3.5 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently
Misc.Awd

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)
Message Closed w/Summary

car Vehicle Data

2005 Chevrolet Uplander LS

VIN 1GNDX33165
Engine3.5 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursIntermittently
Misc.Awd

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)