'97 Ranger 4.0 Check Eng Problem - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 03-06-2011
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'97 Ranger 4.0 Check Eng Problem

I have a '97 Ranger 4.0 and keep getting code "PO141" which says I have a heater malfunction in my O2 sensor (Bk 1 Sensor 2). I've replaced the sensor with a new Motorcraft one and get the same code. Can anyone help me with this?
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Old 03-07-2011
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That's not a malfunction. It's telling you it's too lean. You may have the vacuum leak between the upper to lower intake or a line somewhere. Or even a dirty MAF can give you lean codes.
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Old 03-09-2011
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97 where known for the lower intake gaskets leaking i had lean codes till i replaced them
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