check engine codes 173,176 - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 05-30-2009
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check engine codes 173,176

Well Here i am with codes both stored in the memory hoping for a little help from you guys.
173 (M) Oxygen sensor not switching - system is or was rich - Single, Right or Rear HO2S - Fuel control
176 (M) Oxygen sensor not switching - system is or was lean Left or Front HO2S - Fuel control

A little background information. About once or twice a month I drive for 3 hours to go see my girlfriend. (yeah it's a long drive but my ranger does a good job). Around halfway I have to slow down driving through Tulsa. (From like 75-80 to 65ish) I get a check engine light when slowing down, but when i get back up to speed it goes away. It also comes on when either I'm slowing down getting to her town or coming back to mine.

Any ideas on this? One says rich one says lean... :( one says right or rear the other says left or front... Any ideas here? Also does anybody know how to test the oxygen sensors? I don't have the money right now to throw parts at this.

Thanks in advanced!
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Old 06-02-2009
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anybody? anybody at all?
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