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Ford Windstar Has Lean Banks

Q. Hello: My Check engine light recently illuminated. The OBD-II scan tool gives "Lean Bank 1" and "Lean Bank 2" codes. What troubleshooting sequence do you suggest? Fuel filter? Injectors? Fuel pressure regulator?

  • 1999 Ford Windstar
  • 3.8 liter
  • Automatic transmission
  • 70,000 miles
  • Fuel Injection

Thanks in advance!
Chris

Ford Windstar Has Lean Banks

A. Basically the problem is the engine is running too lean. The most common cause of this is a vacuum leak. So, that would be the first thing to check for. I would also recommend replacing the fuel filter.

If the codes persist, then I would do a fuel pressure test and see what that tells me.

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