1998 Mazda Millennia check engine light

1998 MAZDA MILLENIA
72,002 MILES • 6 CYL • FWD • AUTOMATIC
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1998 Mazda Millennia mileage: 72,000. Yesterday, I got a check engine light. The local AutoZone diagnosed the P0173 code to be "fuel trim". They couldn't elaborate on what that might mean. I just bought the car and to my knowledge the injectors haven't been cleaned. I did have to replace an O2 sensor a month ago. I just read on the web that some cars require a mechanic to disconnect the battery when changing the O2 sensor to reset the long term fuel trim. I remember having to reset the radio after their work. Is it the injectors? What am I missing?
Nov 29, 2010 at 8:47 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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The code you mentioned is a general code for problems with the fuel injection system. It could mean that the fuel pressure regulator is faulty, or something is wrong with the fuel pump or the fuel injectors.
Nov 29, 2010 at 10:16 PM