Something happen simultaneously while driving down. I lost my A/C and the odometer stops registering the actual mileage but the speed still register. Are these two components inter-related ? Are there any relays or fuse that needs to be check ? Please advice on what to do.

The 126 does use an electric speedo so it would stand to reason that there is some sort of electrical problem there. I have seen many fuses partially bad. Replace all of the fuses with new ones.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
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