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View Full Version : P1131 code for a ford expedition


poncho0723
Mar 3, 2010, 08:53 AM
I have a 98 ford expedition and is giving me this code p1131 I all ready replace the idle control valve and still shake a little but now when I'm on the light it shuts off for no reason please help

TxGreaseMonkey
Mar 3, 2010, 09:05 AM
Code P1131: Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.

I would replace the oxygen sensor.