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ABS light on randomly.  Brake pedal pulsed against foot when coming to a slow stop. Scan test with Modis diagnostic device.  Found code for left front wheel speed sensor error.  Begin manual diagnostics. Check for condition of ABS Sounding ring, no problems found. Check for wiring problem with ABS sensor circuit, no problems found.  Found [...]

Customer arrived with check engine light on.  Complaint was loss of fuel economy at the same time the light came on. Ran Snap-On Modis diagnostics to determine problems. Found Oxygen sensor heater circuit to have malfunctioned. Checked integrity of circuit, tested good.  Tested sensor, failed.  Replaced sensor, reset PCM. Back on the road.