Why does the ABS, Brake and Check Engine Light stay on and Speedometer doesn't register till 25mph

Asked by May 22, 2013 at 01:10 PM about the Dodge Ram 1500

Question type: Maintenance & Repair

The ABS, Brake and Check Engine light all stay on and the speedometer doesn't register
till you get around 25mph and also drops out when approaching a stop. All was fine till I
shifted from 2 wheel to 4 wheel and also fueled up. The check engine code was P0138,
O2 sensor down stream. Any suggestions?

1 Answer

8,065

if you have bearing failure in rear diff. Steel particals may be stuck to wheel speed sensor.Sensor has a magnet in it that will cause metal to block out signal.

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