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Doosan (& Daewoo) PRO 5:
error code 751 flashing

Flashing code 751.I need help with this code and what to check for?
  • Posted 10 Sep 2015 02:01
  • Modified 10 Sep 2015 02:02 by poster
  • Discussion started by greasespoon
  • somerset, United Kingdom
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Showing items 1 - 2 of 2 results.
So no air through either side right?
  • Posted 23 Feb 2022 09:46
  • Reply by Jose_Felix
  • California, United States
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Check for Vac. leaks, and the Fuel Trim Valves. You can Ohm them out should be 26+/- 2 ohms. If you can blow air through them then they are faulty and stuck open.

The fault code reads as Pre-Catalyst 02 sensor indicates extended lean operation. This is odd as the system is designed to run rich when something goes wrong with the fuel system.
  • Posted 5 Oct 2017 23:15
  • Reply by sirthor1881
  • Georgia, United States
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