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2001 Cadillac DeVille 4.6L MIL Lamp on
Posted to GM Driveability on 4/14/2007 27 Replies

This car ever so often shows #420 code. Has had three cat. converters put on it. The code disappears each time afterwords. No set time. Last one was about a year ago. No other codes. All cats. have been aftermarket. The first one was in Canada. I would go O.E....

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Message Closed w/FIX

car Vehicle Data

2001 Cadillac DeVille

VIN 1G6KD54Y31
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / sefi
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursCold, Idle, Intermittently

Trouble Codes

420catalyst efficiency
Message Closed w/FIX

car Vehicle Data

2001 Cadillac DeVille

VIN 1G6KD54Y31
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / sefi
EmissionsOBD-II Compliant
SymptomsMIL Lamp On
OccursCold, Idle, Intermittently

Trouble Codes

420catalyst efficiency