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86 Deville


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Why do you want to unplug the vacuum pump? It is there to provide additional vacuum to supplement the engine vacuum for such things as the power brake booster and climate controls.

Simultaneously press and hold the OFF and WARMER buttons on the climate control panel. The system will go into a segment check and then display the trouble codes. Write them down and post back. When the system displays .7.0, it is awaiting further input.

It's been a long time since I worked on a 4100 but I think you press and hold the OFF and one of the buttons (RANGE??) on the fuel data panel to clear the codes.

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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Hey there...

E44:Oxygen (O2) sensor lean

E47:Body Control Module (BCM) to Electronic Control Module (ECM) data fault

As for the E.E and E. prefixes:

.E. means the codes are stored in the history of the ECM.

E.E. are the current codes.

To erase the ECM codes, simultaneously press the OFF and HI buttons until E.0.0 is displayed.

As for the BCM codes, press OFF and LO until F.0.0 is displayed.

Hope this helps, are you experiencing any other symptoms?


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